U.S. Air Force and Japan Air Self-Defense Force Airmen assemble frames during Silver Flag Dec. 5, 2016, at Northwest Field, Guam. U.S. Pacific Command’s partner nation Silver Flag training classes are held to promote mutual understanding between partner nations and PACAF civil engineers' missions, capabilities and objectives. (U.S. Air Force photo by Senior Airman Arielle K. Vasquez/Released)

Japan Air Self-Defense Force Staff Sgt. Kentaro Ikeda repairs a fuel line during Silver Flag Dec. 1, 2016, at Northwest Field, Guam. Silver Flag is designed to engage, exercise and train with partner nation civil engineers to strengthen and increase interoperability. (U.S. Air Force photo by Senior Airman Arielle K. Vasquez/Released)

Airmen with the Japan Air Self-Defense Force conduct Mobile Aircraft Arresting System installation training Dec. 6, 2016, at Northwest Field, Guam. A MAAS is a rapid installation emergency system used to recover fighter aircraft returning to and launching from a battle damaged airfield. (U.S. Air Force photo by Senior Airman Arielle K. Vasquez/Released)

Airmen with the Japan Air Self-Defense Force operate a reverse osmosis water purification unit during Silver Flag Dec. 6, 2016, at Northwest Field, Guam. Silver Flag is a U.S. Pacific Command multilateral subject matter expert exchange led by engineers from the 554th RED HORSE Squadron. The exercise is designed to build partnerships and promote interoperability through the equitable exchange of civil engineer-related information. (U.S. Air Force photo by Senior Airman Arielle K. Vasquez/Released)

Japan Air Self-Defense Force Staff Sgt. Makoto Mizuhara pulls on a rope during Silver Flag Dec. 5, 2016, at Northwest Field, Guam. U.S. Air Force and JASDEF Airmen spent a week sharing civil engineering techniques to build partnerships and promote interoperability. (U.S. Air Force photo by Senior Airman Arielle K. Vasquez/Released)

U.S. Air Force Japan Air Self-Defense Force Airmen use a chemical detector during Silver Flag Dec 6. 2016, at Northwest Field, Guam. Silver Flag is a U.S. Pacific Command multilateral subject matter expert exchange led by engineers from the 554th RED HORSE Squadron. The exercise is designed to build partnerships and promote interoperability through the equitable exchange of civil engineer-related information. (U.S. Air Force photo by Senior Airman Arielle K. Vasquez/Released)