U.S. Ambassador to Estonia Jeffrey Levine asks U.S. Air Force Tech Sgt. Chris Kelly, a crew chief for the 175th Aircraft Maintenance Squadron, about the A-10C Thunderbolt II assigned to the 104th Fighter Squadron, Maryland Air National Guard, on his visit to Amari Air Base, Estonia on June 7, 2013, during Saber Strike. Saber Strike 2013 is a multinational exercise involving approximately 2,000 personnel from 14 countries and is designed to improve NATO interoperability and strengthen the relationships between military forces of the U.S., Estonia and other participating nations. (U.S. Air National Guard photo by Staff Sgt. Benjamin Hughes)

170808-N-KB401-544 ATLANTIC OCEAN (Aug. 8, 2017) Left to right, Royal Navy aircraft carrier HMS Queen Elizabeth (R08), Royal Norwegian Navy frigate Helge Ingstad (F 313), Nimitz-class aircraft carrier USS George H.W. Bush (CVN 77), and guided-missile destroyer US Donald Cook (DDG 75) sail in formation for a photo exercise during exercise Saxon Warrior 2017, Aug.8. Saxon Warrior is a United States and United Kingdom co-hosted carrier strike group exercise that demonstrates interoperability and capability to respond to crises and deter potential threats. (U.S. Navy photo by Mass Communication Specialist 2nd Class Michael B. Zingaro/Released)

KORAT ROYAL THAI AIR FORCE BASE, Thailand (March 3. 2017) - U.S. Air Force Lt. Col. James McFarland, exercise director for the U.S. Air Force greets Royal Thai air force (RTAF) Air Chief Mashal Surasak Toongtong, Chief of the Air Staff for the RTAF during his arrival to the closing ceremony for Cope Tiger 17 at Korat Royal Thai Air Force Base. The annual multilateral exercise is aimed at improving combined combat readiness and interoperability between the Republic of Singapore air force, Royal Thai air force, and U.S. Air Force, while concurrently enhancing the three nations' military relations. (U.S. Air Force photo by Staff Sgt. Kamaile Chan) 170331-F-QA288-0003

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GRAFENWOEHR, Germany -- Soldiers with the British 3rd Battalion, the Mercian Regiment, based in Fallingbostel, Germany, load charges into a Challenger 2 tank crew during a weapons qualifying range at the Joint Multinational Training Command's Grafenwoehr Training Area before taking part in Saber Junction here Oct. 15. The mission is part of U.S. Army Europe's exercise Saber Junction which trains U.S. personnel and more than 1800 multinational partners from 18 different nations ensuring multinational interoperability and an agile, ready coalition force. (U.S. Army Europe photo by Staff Sgt. Joel Salgado)

A convoy of U.S. Army Europe's 4th Squadron, 2nd Cavalry Regiment moves through the German countryside near Grafenwoehr, Germany, during Saber Junction 2012, Oct. 15. The U.S. Army in Europe's exercise Saber Junction trains U.S. personnel and more than 1800 multinational partners from 18 European nations, ensuring interoperability between forces and an agile, ready coalition force. (U.S. Army Europe photo by Visual Information Specialist Markus Rauchenberger/Released)

A Bulgarian Air Force pilot discusses an upcoming combat search and rescue mission during exercise Saber Guardian 17 with a member of A Company, 2-10 Assault Helicopter Battalion, at Plovdiv, Bulgaria, on July 10. Effective planning and understanding of how each side operates ensures successful missions and that interoperability between NATO Allies is being built. (U.S. Army photo by Spc. Thomas Scaggs) 170710-A-TZ475-080

VARPALOTA TRAINING AREA, Hungary - Saker Falcon is a multinational training exercise involving roughly 200 Soldiers from U.S. Army Europe's 12th Combat Aviation Brigade, two Dutch Air Assault battalions, and Hungarian military forces. The objectives of the training include enhancing joint combined interoperability with allied and partner nations and preparing participants to operate in a joint, multinational, integrated environment with support from Hungarian governmental agencies. Saker Falcon, underway from April 3 through April 17, reinforces U.S. Army Europe's strategic objectives to increase regional flexibility, preserve and enhance NATO interoperability, and facilitate multinational training. (Royal Netherlands Army photo by Cpl. Zadrach Salampessy)

AQABA, Jordan (May 27, 2014) Marines with Motor Transportation Maintenance Company, 1st Maintenance Battalion, Combat Logistics Regiment 15, assemble an armored truck during Exercise Eager Lion 2014, at the Port of Aqaba. Eager Lion is a recurring, multinational exercise designed to strengthen military-to-military relationships, increase interoperability between partner nations and enhance regional security and stability. (U.S. Marine Corps photo by Sgt. Laura Gauna/Released)

160607-N-PF515-003 BERGA, Sweden (June 7, 2016) Sailors attached to Explosive Ordnance Disposal Group Two and Commander, Task Group 68’s Expeditionary Mine Countermeasures Company, transfer a MK 18 Mod 2 Kingfish, an unmanned underwater vehicle, during BALTOPS 2016, June 7. BALTOPS is an annual recurring multinational exercise designed to improve interoperability, enhance flexibility, and demonstrate the resolve of allied and partner nations to defend the Baltic region. (U.S. Navy photo by Mass Communication Specialist 1st Class America A. Henry/ Released)

A Polish army Rosomak armored personnel carrier, or "Wolverine," with the 12th Mechanized Brigade, fords water during the Allied Spirit VIII training exercise at Hohenfels Training Area, Germany, Jan. 25, 2018. Allied Spirit VIII is a multinational exercise with over 4,100 participants from the U.S. and nine other nations that is designed to enhance interoperability and readiness across war-fighting functions. (U.S. Army photo by Spc. Hubert D. Delany III / 22nd Mobile Public Affairs Detachment)

Observers from the U.S. and Serbian Army Soldier watch as Serbian troops prepare to conduct a squad engagment exercise during Rapid Trident 2012 in Yavoriv, Ukraine, July 17. Rapid Trident supports interoperability among Ukraine, the United States, NATO and Partnership for Peace member nations. Approximately 1,400 personnel from 16 different nations are participating in the exercise which will consist of multi-national academic course and situational and field training exercises. (Photo by U.S. Army Staff Sgt. Brooks Fletcher, U.S. Army Europe Public Affairs)

Donald Trump arrives at the Grove Hotel for the NATO Leaders Meeting.

The UK Prime Minister Boris Johnson hosts the NATO leaders Meeting at The Grove in Watford today, the 4th December 2019.

This meeting marks 70 years of the NATO alliance.

Established in 1949 with 12 founding members, NATO is now an alliance of 29 countries. At the heart of NATO is collective defence, set out in Article 5 of the North Atlantic Treaty, NATO’s founding Treaty. The UK is one of NATO’s 12 founding members and London was home to its first headquarters.

U.S. Marines with Marine Medium Tiltrotor Squadron (VMM) 161 transport Marines on MV-22B Ospreys from San Clemente Island to Camp Pendleton, Calif., during Exercise Iron Fist 2014, Feb. 15, 2014. Iron Fist is an amphibious exercise that brings together Marines and Sailors from the 15th Marine Expeditionary Unit, other I Marine Expeditionary Force units, and soldiers from the Japan Ground Self-Defense Force, to promote military interoperability and hone individual and small-unit skills through challenging, complex and realistic training. (U.S. Marine Corps photo by Sgt. Jamean R. Berry/Released)

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Lance Cpl. Nathaniel Rasmusson, a machine gunner with the 3rd Bn., 23rd Marine Regiment, points to the direction of potential enemy fire to Ghanaian Soldiers during Exercise Western Accord 14, June 19, near Camp Thies, Senegal. The unit trained Soldiers from different nations in various techniques and procedures for searching and detaining internally displaced personnel. Exercise Western Accord is a U.S. Africa Command sponsored annual joint training partnership exercise between the United States, the Economic Community of West African States and partner nations. The exercise is designed to increase interoperability between military forces and ensure the common ability to conduct peace operations throughout western Africa. (U.S. Army Africa photo by Staff Sgt. V. Michelle Woods)

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Participating in an international cooperative national defense exercise, Soldiers of the Minnesota National Guard’s 1st Combined Arms Battalion – 194th Armor conduct interoperability training alongside their Swedish counterparts Sept. of 2017. This is the first time in over 20 years that Americans have been asked to participate in the Aurora Exercise which is comprised of several surrounding countries’ militaries as well as over 19,000 men and women of the Swedish Armed Forces. (Courtesy of the Minnesota National Guard)

Estonian Air Force Lt. Col. Arvo Palumäe speaks with U.S. Air Force Brig. Gen. Scott Kelly, Commander 175th Wing, Maryland Air National Guard, before his incentive flight in an Estonia Air Force L-39 Fighter Aircraft during Sabre Strike at Amari Air Base, Estonia on June 6, 2013. Saber Strike 2013 is a multinational exercise involving approximately 2,000 personnel from 14 countries and is designed to improve NATO interoperability and strengthen the relationships between military forces of the U.S., Estonia and other participating nations. (U.S. Air National Guard photo by Staff Sgt. Benjamin Hughes)

U.S. Marines with the 15th Marine Expeditionary Unit's Maritime Raid Force practice visit, board, search and seizure techniques during maritime interoperability training off the coast of Camp Pendleton, Calif., Jan. 13, 2015. MIT prepares the MRF for their upcoming deployment by enhancing their combat skills, and teaching them techniques for boarding vessels. (U.S. Marine Corps photo by Sgt. Jamean Berry/Released)

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CHILDREN'S SURGICAL CENTRE, PHENOM PENH, Kingdom of Cambodia (Jul. 17, 2011) – Navy Lt. Charles J. Siegert, left, a general surgeon with 3rd Medical Battalion, and Huot Vutha, right, a Cambodian surgery trainee, work alongside each other to perform a surgical operation on a baby at Children's Surgical Centre. The surgical training is part of Cambodia Interoperability Program 2011, a regularly-held exercise between the U.S. and Cambodian forces that allows both nations to conduct joint-medical and dental operations, improve interoperability through working together and foster goodwill to ensure regional peace and stability. (U.S. Marine Corps photo Cpl. Kentavist P. Brackin)

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German Army Maj. Thomas Teichert, left, of the German Army Combat Training Center (GACTC) emphasizes key points in a mission scenario while conducting an after action review with U.S. Soldiers of Alpha Company, 3rd Battalion, 69th Armor Regiment and German soldiers of the GACTC during exercise Letzlingen Freedom Shock at the GACTC in Letzlingen, Germany, April 27, 2015. Exercise Letzlingen Freedom Shock strengthens interoperability between the German and American training organizations while highlighting U.S. Army Europe's rapid deployment capabilities. (U.S. Army photo by Sgt. Ian Schell)

Members of the Maryland National Guard and the Estonian Defense League gather at Alu Manor in Raplamaa, Estonia is the site for the 20th anniversary celebration state partnership program between the Estonian Military and the Maryland National Guard on June 4, 2013. Maj. Gen. Adkins traveled to Estonia to celebrate this accomplishment during Sabre Strike 2013. Saber Strike 2013 is a U.S. Army Europe-led, multinational, tactical field training and command post exercise occurring in Lithuania, Latvia and Estonia June 3-14 that involves more than 2,000 personnel from 14 different countries. The exercise trains participants on command and control as well as interoperability with regional partners and is designed to improve joint, multinational capability in a variety of missions and to prepare participants to support multinational contingency operations worldwide. (U.S. Air National Guard photo by Staff Sgt. Benjamin Hughes)

Members of the German and International media visit U.S. Army soldiers, assigned to Headquarters Troop, 2nd Cavalry Regiment, Monday, 15 October, 2012, to video, photograph and interview U.S. and multinational Soldiers during USAREUR's Saber Junction 2012 exercise. The 2 CR Soldiers were in the process of moving their headquarters south towards Hohenfels and were setting up communications outside the Bavarian town of Kleinoberpfalz. HQ Troop, 2 CR, based in Vilseck, Germany, is commanded by Col. Keith Barclay.

The U.S. Army in Europe's exercise Saber Junction trains U.S. personnel and more than 1800 multinational partners from 18 European nations, ensuring interoperability between forces and an agile, ready coalition force. (U.S. Army Photo by Michael Beaton/Released).

ARTA TRAINING RANGE, Djibouti (Oct. 4, 2015) U.S. Marines with the 15th Marine Expeditionary Unit provide security during a desert survival and tactics course with the French 5th Overseas Combined Arms Regiment (RIAOM). Elements of the 15th MEU trained with the 5th RIAOM in Djibouti in order to improve interoperability between the MEU and the French military. (U.S. Marine Corps photo by Sgt. Steve H. Lopez/Released)

A U.S. Army Europe Stryker vehicle, assigned to 2nd Squadron, 2nd Cavalry Regiment moves though the Maneuver Rights Area near Amberg, Germany, during Saber Junction 2012 Oct. 16. The U.S. Army Europe's exercise Saber Junction trains U.S. personnel and 1800 multinational partners from 18 nations ensuring multinational interoperability and an agile, ready coalition force.

(U.S. Army Europe photo by Visual Information Specialist Markus Rauchenberger/Released)

U.S. Marine Staff Sgt. Jerad L. Wilcox, platoon sergeant, Echo Battery, 2nd Battalion, 11th Marine Regiment, observes a firing mission during Exercise Iron Fist 2014 aboard Camp Pendleton, Calif., Feb. 6, 2014. Iron Fist 2014 is an amphibious exercise that brings together Marines and Sailors from the 15th Marine Expeditionary Unit, other I Marine Expeditionary Force units, and soldiers from the Japan Ground Self-Defense Force, to promote military interoperability and hone individual and small-unit skills through challenging, complex and realistic training. (U.S. Marine Corps photo by Sgt. Jamean R. Berry/Released)

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U.S. Army Capt. Jason Cox, a civil affairs officer, trains Romanian Multinational Division-South East (MND-SE) Lt. Col. George Feleaga, a civilian-military cooperation officer, on procedures concerning the freedom of movement and maneuverability for land forces and the safety of the civilian population during procedures during the Exercise Saber Guardian 2016 command post exercise at the Romanian Land Forces Combat Training Center, Cincu, Romania July 30, 2016. The command post exercise simulation is a Joint Combined Exchange Training event that further augments our communications and interoperability. The commanders and staffs are trained in the development of combined planning, standing operating procedures and staff battle drills in a force-on-force environment to demonstrate continued commitment to the collective security of NATO and dedication to enduring peace and stability in the region. (U.S. Army photo by Staff Sgt. Anita VanderMolen, 115th Mobile Public Affairs Detachment, Oregon Army National Guard)

Minister of Defence of Bosnia and Herzegovina Marina Pendes

U.S. Army Europe Soldiers, assigned to 2nd Cavalry Regiment, scan the battlefield during Saber Junction 2012 at the Joint Multinational Readiness Center in Hohenfels, Germany, Oct. 25. The U.S. Army Europe's exercise Saber Junction trains U.S. personnel and 1800 multinational partners from 18 nations ensuring multinational interoperability and an agile, ready coalition force.

(U.S. Army Europe photo by Visual Information Specialist Markus Rauchenberger/released)

An international Soldier participates in the Advanced High Angle Sniper Course, conducted by the International Special Training Center (ISTC), April 27-May 1, 2015 in Lizum, Austria. The students from the U.S. and European allies received the training to enhance their sniper skills to support NATO Soldiers, Sailors, and Airmen by special forces-oriented procedures and skills. The ISTC provides centralized training for NATO Special Forces and similar units in Europe. The center is run by a cadre of instructors from nine member nations: Belgium, Denmark, Germany, Greece, Italy, the Netherlands, Norway, Turkey and the U.S. (U.S. Army photo by Visual Information Specialist Jason Johnston/Released)

Battle Group Poland U.S. medics move a casualty through an obstacle during search and rescue training conducted near the Bemowo Piskie Training Area during Saber Strike 17 June 9. Saber Strike 17 is a U.S. Army Europe-led multinational combined forces exercise conducted annually to enhance the NATO alliance throughout the Baltic region and Poland. This year’s exercise includes integrated and synchronized deterrence-oriented training designed to improve interoperability and readiness of the 20 participating nations’ militaries. (U.S. Army photo by Sgt. Jimmy Golden/ Released)

U.S. Army Europe Soldiers, assigned to 2nd Cavalry Regiment, study a map and prepare to convoy though the Maneuver Rights Area near Amberg, Germany in route to the Joint Multinational Readiness Center’s Hohenfels Training Area, Oct. 16. The U.S. Army Europe's exercise Saber Junction 2012 trains U.S. personnel and 1800 multinational partners from 18 nations ensuring multinational interoperability and an agile, ready coalition force.

(U.S. Army Europe photo by Visual Information Specialist Markus Rauchenberger/Released)

Paratroopers assigned to the British 16 Air Assault Brigade land on Holland Drop Zone on Fort Bragg, N.C., March 17, 2015. The jump certified the British paratroopers to conduct a joint forcible entry operation for the Combined Joint Operational Access Exercise led by 2nd BCT in April. The CJOAX represents a major milestone in the Division’s interoperability program which seeks to create a seamless integration of a U.K. brigade into the Division and build operational compatibilities for multinational crisis response options. (82nd Airborne Division photo by Staff Sgt. Jason Hull/Released)

PHILIPPINE SEA (March 16, 2019) Cmdr. Jonathan Hopkins, commanding officer of the Arleigh Burke-class guided-missile destroyer USS Milius (DDG 69), mans his console in the ship's combat information center. U.S. Navy warships train together to increase the tactical proficiency, lethality and interoperability of participating units in an Era of Great Power Competition. (U.S. Navy photo by Mass Communication Specialist 1st Class Rufus Hucks/Released)

Maj. Gen. Salim Mustafa Kijuu, commander of Land Forces, Tanzania People’s Defence Force, and Brig. Gen. Zoma Kongo, director of Operations, TPDF, receive a briefing at the Joint Multinational Readiness Center during a visit at the 7th Army Joint Multinational Training Command's Hohenfels Training Area, Germany, July 10 as part of a Command Sponsored Visit coordinated by U.S. Army Africa on behalf of the U.S. Army. CSVs bring together senior land force commanders from nations around the world to discuss mutual security concerns and to increase interoperability. USARAF hosted the annual Gender Mainstreaming Seminar in Tanzania in May of this year and will conduct the African Land Forces Summit and the Eastern Accord 16 exercise in Tanzania next year. These visits help build partnerships over time and across echelons, the key concept behind USARAF's African Horizons strategy. .

(U.S. Army Africa photo Markus Rauchenberger)

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PACIFIC OCEAN (July 12, 2021) Chief Master-at-Arms Cornelius Johnson stands watch on the bridge aboard the Spearhead-class expeditionary fast transport USNS City of Bismarck (T-EPF 9). City of Bismarck is serving as the mission platform for Pacific Partnership 21. Pacific Partnership, now in its 16th iteration, brings nations together to prepare during calm periods to effectively respond in times of crisis. Each year, the mission team works collectively with host and partner nations to enhance regional interoperability and disaster response capabilities, increase security and stability in the region, and foster new and enduring friendships in the Indo-Pacific. (U.S. Navy Photo by Chief Mass Communication Specialist Joseph R. Vincent/Released)

VARPALOTA TRAINING AREA, Hungary - Saker Falcon is a multinational training exercise involving roughly 200 Soldiers from U.S. Army Europe's 12th Combat Aviation Brigade, two Dutch Air Assault battalions, and Hungarian military forces. The objectives of the training include enhancing joint combined interoperability with allied and partner nations and preparing participants to operate in a joint, multinational, integrated environment with support from Hungarian governmental agencies. Saker Falcon, underway from April 3 through April 17, reinforces U.S. Army Europe's strategic objectives to increase regional flexibility, preserve and enhance NATO interoperability, and facilitate multinational training. (Royal Netherlands Army photo by Cpl. Zadrach Salampessy)

Deputy Defence Minister of Kazakhstan Maj.Gen. Talgat Mukhtarov

Meeting the vision: practical requirements for regional performance & interoperability

Gunnery Sgt. Dragos Coca engages targets during a desert survival and tactics course. Coca is a platoon sergeant with 15th Marine Expeditionary Unit. Elements of the 15th MEU trained with the 5th Overseas Combined Arms Regiment in Djibouti from Sept. 21 to Oct. 7 in order to improve interoperability between the MEU and the French military.

(U.S. Marine Corps photo by Sgt. Steve H. Lopez/Released)

Moldovan soldiers take a break during Rapid Trident 2012 in Yavoriv, Ukraine, July 18. Rapid Trident is a multinational exercise held at the International Peacekeeping and Security Center in Yavoriv, Ukraine. It is designed to promote regional stability and security, strengthen international military partnering and foster trust while improving interoperability between participating nations. (Photo by Lt. Col. Vladimir Skorostetskiy, Ukrainian Army Public Affairs)

Canadian Army Capt. Rob Johnson, along with U.S. Soldiers from the California Army National Guard, stand in formation during the Rapid Trident 2012 opening ceremony held at the International Peacekeeping and Security Center in Yavoriv, Ukraine, July 16. Rapid Trident supports interoperability among Ukraine, the United States, NATO and Partnership for Peace member nations. Approximately 1,400 personnel from 16 different nations are participating in the exercise which will consist of multi-national academic course and situational and field training exercises. (Photo by U.S. Army Staff Sgt. Brooks Fletcher, U.S. Army Europe Public Affairs)

U.S. Marines with 1st Battalion, 1st Marine Regiment, post security while conducting an amphibious landing during Exercise Iron Fist 2014 aboard Camp Pendleton, Calif., Feb. 19, 2014. Iron Fist is an amphibious exercise that brings together Marines and sailors from the 15th Marine Expeditionary Unit, other I Marine Expeditionary Force units, and soldiers from the Japan Ground Self-Defense Force, to promote military interoperability and hone individual and small-unit skills through challenging, complex and realistic training. (U.S. Marine Corps photo by Lance Cpl. Ricardo Hurtado/Released)

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MANILA, Philippines (July 29, 2021) U.S. Air Force Capt. Jayde Alisasis takes a photo during a medical demonstration by Philippine Navy sailors during a Pacific Partnership 21 medical discussion. Pacific Partnership, now in its 16th iteration, brings nations together to prepare during calm periods to effectively respond in times of crisis. Each year, the mission team works collectively with host and partner nations to enhance regional interoperability and disaster response capabilities, increase security and stability in the region, and foster new and enduring friendships in the Indo-Pacific. (U.S. Navy Photo by Chief Mass Communication Specialist Joseph R. Vincent/Released)

U.S. Navy Sailors and Marines with the 15th Marine Expeditionary Unit's Maritime Raid Force drive Rigid-Hulled Inflatable Boats during maritime interoperability training off the coast of Camp Pendleton, Calif., Jan. 12, 2015. MIT prepares the 15th MEU's MRF for their upcoming deployment by enhancing their combat skills and teaching them techniques for boarding vessels. (U.S. Marine Corps photo by Sgt. Jamean Berry/Released)

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ARTA TRAINING RANGE, Djibouti (Oct. 4, 2015) U.S. Marines with the 15th Marine Expeditionary Unit move to a new objective during a desert survival and tactics course. Elements of the 15th MEU trained with the 5th Overseas Combined Arms Regiment (RIAOM) in Djibouti in order to improve interoperability between the MEU and the French military. (U.S. Marine Corps photo by Sgt. Steve H. Lopez/Released)

YAVORIV, Ukraine -- Ukrainian paratroopers inspect each other's equipment prior to an airborne operation July 9 at Exercise Rapid Trident. Rapid Trident 2013 is a U.S. Army Europe-led, multinational field training and command post exercise occurring at the International Peacekeeping and Security Center in Yavoriv, Ukraine July 8-19 that involves approximately 1,300 troops from 17 nations. The exercise is designed to enhance interoperability between forces and promote regional stability and security. (U.S. Army photo by Sgt. Daniel Cole)

U.S. Air Force Tech Sgt. Sean Sullivan, 175th Maintenance Squadron, Maryland Air National Guard, works on an A-10C Thunderbolt II engine at Amari Air Base, Estonia on June 7, 2013, during Saber Strike. Saber Strike 2013 is a multinational exercise involving approximately 2,000 personnel from 14 countries and is designed to improve NATO interoperability and strengthen the relationships between military forces of the U.S., Estonia and other participating nations. (U.S. Air National Guard photo by Staff Sgt. Benjamin Hughes)

U.S Marines with the 15th Marine Expeditionary Unit's Maritime Raid Force post security while boarding the ATLS-9701 during maritime interoperability training in the San Diego Bay, Calif., Jan. 11, 2015. MIT prepares the 15th MEU's MRF for their upcoming deployment by enhancing their combat skills and teaching them techniques for boarding vessels. (U.S. Marine Corps photo by 1st Lt. Allison Burgos/Released)

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Pvt. Joseph Hamilton, a cavalry scout assigned to Outlaw Troop, 4th Squadron, 2nd Cavalry Regiment, waits in line for fuel from members of the Czech armed forces during a brief refueling stop at a local airfield while participating in Dragoon Crossing, a tactical road march starting out at Rose Barracks, Germany and continuing through the Czech Republic and the Slovak Republic ending in Hungary on Sept. 13, 2015. The purpose of the exercise is to reassure NATO Allies of the U.S. intent during Operation Atlantic Resolve while demonstrating interoperability and freedom of movement throughout Eastern Europe. (U.S. Army photo by Sgt. William A. Tanner/released)

GRAFENWOEHR, Germany -- A convoy of U.S. Army Europe's 4th Squadron, 2nd Cavalry Regiment moves through the German countryside near Grafenwoehr, Germany, during Saber Junction 2012, Oct. 15. Saber Junction trains U.S. personnel and 1800 multinational partners from 18 nations ensuring interoperability and an agile, ready coalition force.

(U.S. Army Europe photo by Visual Information Specialist Markus Rauchenberger/released)

Cpt. Ryan Kidlow, a Green Bay, Wisconsin native and a civil affairs team chief with the 415th Civil Affairs Battalion, listens to a role-player citizen in a simulated town during training at Hohenfels Training Area, Germany, Jan. 25, 2018. Kidlow is participating in Allied Spirit VIII, a multinational exercise with over 4,100 participants from 10 nations that is designed to enhance interoperability among nations and readiness across the military's war-fighting functions. (U.S. Army photo by Spc. Hubert D. Delany III / 22nd Mobile Public Affairs Detachment)