Two U.S. Air Force B-1B Lancers assigned to the 37th Expeditionary Bomb Squadron, deployed from Ellsworth Air Force Base (AFB), S.D., taxis before take off from Andersen AFB, Guam to fly sequenced bilateral missions with two Japan Air Self-Defense Force (JASDF) F-15s and two Republic of Korea air force (ROKAF) F-15Ks in the vicinity of the Sea of Japan, Oct. 10, 2017. The purpose of bilateral training is to foster increased interoperability amongst Japan, South Korea and U.S. aircraft. Participating in bilateral training enables the operational units to improve their combined capabilities and tactical skills, while also building bilateral confidence and strong working relationships. (U.S. Air Force photo by Senior Airman Jacob Skovo)