Aircrew from the 909th Aircraft Refueling Squadron, Kadena Air Base, Japan, prepare to land a KC-135 Stratotanker during the Rim of the Pacific Exercise on Joint Base Pearl Harbor-Hickam, July 14, 2016. The exercise has a total of 49 ships, six submarines, 200 aircraft, and 25,000 personnel participating. RIMPAC is the world’s largest international maritime exercise, providing a unique training opportunity while fostering and sustaining cooperative relationships between participants critical to ensuring the safety of sea lanes and security on the world’s oceans. RIMPAC 2016 is the 25th exercise in the series that began in 1971. (U.S. Air Force photo by Tech. Sgt. Aaron Oelrich/Released)

U.S. Air Force Senior Airman Cory Drummond, a 909th Aircraft Refueling Squadron boom operator, refuels a B-52H Stratofortress assigned to the 69th Bomb Squadron, Minot Air Force Base, N.D., over the Pacific Ocean during an international sinking exercise for Rim of the Pacific 2016 near Joint Base Pearl Harbor-Hickam, July 14, 2016. Twenty-six nations, more than 40 ships and submarines, more than 200 aircraft, and 25,000 personnel are participating in RIMPAC from June 30 to Aug. 4 in and around the Hawaiian Islands and Southern California. The world's largest international maritime exercise, RIMPAC, provides a unique training opportunity that helps participants foster and sustain the cooperative relationships that are critical to ensuring the safety of sea lanes and security on the world's oceans. RIMPAC 2016 is the 25th exercise in the series that began in 1971. (U.S. Air Force photo by Tech. Sgt. Aaron Oelrich/Released)

A B-52H Stratofortress from the 69th Bomb Squadron, Minot Air Force Base, N.D., prepares to receive fuel from a KC-135 Stratotanker over the Pacific Ocean during an international sinking exercise for Rim of the Pacific 2016 near Joint Base Pearl Harbor-Hickam, July 14, 2016. Twenty-six nations, more than 40 ships and submarines, more than 200 aircraft, and 25,000 personnel are participating in RIMPAC from June 30 to Aug. 4 in and around the Hawaiian Islands and Southern California. The world's largest international maritime exercise, RIMPAC, provides a unique training opportunity that helps participants foster and sustain the cooperative relationships that are critical to ensuring the safety of sea lanes and security on the world's oceans. RIMPAC 2016 is the 25th exercise in the series that began in 1971. (U.S. Air Force photo by Tech. Sgt. Aaron Oelrich/Released)

A B-52H Stratofortress from the 69th Bomb Squadron, Minot Air Force Base, N.D., prepares to receive fuel from a KC-135 Stratotanker, over the Pacific Ocean during an international sinking exercise for Rim of the Pacific 2016 near Joint Base Pearl Harbor-Hickam, July 14, 2016. Twenty-six nations, more than 40 ships and submarines, more than 200 aircraft, and 25,000 personnel are participating in RIMPAC from June 30 to Aug. 4 in and around the Hawaiian Islands and Southern California. The world's largest international maritime exercise, RIMPAC, provides a unique training opportunity that helps participants foster and sustain the cooperative relationships that are critical to ensuring the safety of sea lanes and security on the world's oceans. RIMPAC 2016 is the 25th exercise in the series that began in 1971. (U.S. Air Force photo by Tech. Sgt. Aaron Oelrich/Released)

A B-52H Stratofortress assigned to the 69th Bomb Squadron, Minot Air Force Base, N.D., prepares to receive fuel from a KC-135 Stratotanker over the Pacific Ocean during an international sinking exercise for Rim of the Pacific 2016 near Joint Base Pearl Harbor-Hickam, July 14, 2016. Twenty-six nations, more than 40 ships and submarines, more than 200 aircraft, and 25,000 personnel are participating in RIMPAC from June 30 to Aug. 4 in and around the Hawaiian Islands and Southern California. The world's largest international maritime exercise, RIMPAC, provides a unique training opportunity that helps participants foster and sustain the cooperative relationships that are critical to ensuring the safety of sea lanes and security on the world's oceans. RIMPAC 2016 is the 25th exercise in the series that began in 1971. (U.S. Air Force photo by Tech. Sgt. Aaron Oelrich/Released)

A B-52H Stratofortress from the 69th Bomb Squadron, Minot Air Force Base, N.D., flies over the Pacific Ocean during an international sinking exercise for Rim of the Pacific 2016 near Joint Base Pearl Harbor-Hickam, July 14, 2016. Twenty-six nations, more than 40 ships and submarines, more than 200 aircraft, and 25,000 personnel are participating in RIMPAC from June 30 to Aug. 4 in and around the Hawaiian Islands and Southern California. The world's largest international maritime exercise, RIMPAC, provides a unique training opportunity that helps participants foster and sustain the cooperative relationships that are critical to ensuring the safety of sea lanes and security on the world's oceans. RIMPAC 2016 is the 25th exercise in the series that began in 1971. (U.S. Air Force photo by Tech. Sgt. Aaron Oelrich/Released)

A B-52H Stratofortress from the 69th Bomb Squadron, Minot Air Force Base, N.D., flies over the Pacific Ocean during an international sinking exercise for Rim of the Pacific 2016 near Joint Base Pearl Harbor-Hickam, July 14, 2016. Twenty-six nations, more than 40 ships and submarines, more than 200 aircraft, and 25,000 personnel are participating in RIMPAC from June 30 to Aug. 4 in and around the Hawaiian Islands and Southern California. The world's largest international maritime exercise, RIMPAC, provides a unique training opportunity that helps participants foster and sustain the cooperative relationships that are critical to ensuring the safety of sea lanes and security on the world's oceans. RIMPAC 2016 is the 25th exercise in the series that began in 1971. (U.S. Air Force photo by Tech. Sgt. Aaron Oelrich/Released)

1st Lt. Brandon Aist, a 909th Air Refueling Squadron pilot, lines up to land a KC-135 Stratotanker during the Rim of the Pacific Exercise on Joint Base Pearl Harbor-Hickam, July 14, 2016. The exercise has a total of 49 ships, six submarines, 200 aircraft, and 25,000 personnel participating. RIMPAC is the world’s largest international maritime exercise, providing a unique training opportunity while fostering and sustaining cooperative relationships between participants critical to ensuring the safety of sea lanes and security on the world’s oceans. RIMPAC 2016 is the 25th exercise in the series that began in 1971. (U.S. Air Force photo by Tech. Sgt. Aaron Oelrich/Released)