Staff Sgt. Justin Gautreau, 51st Maintenance Group quality assurance manager, assists in running a weight and balance test an a F-16 Fighting Falcon as members of the Republic of Korea Air Force observe at Osan Air Base, Republic of Korea, Oct. 14, 2015. The ROKAF joined up with U.S. Air Force quality assurance technicians to learn how to properly weigh and balance aircraft systems. (U.S. Air Force photo/Staff Sgt. Amber Grimm)