Royal Australian Air Force (RAAF) Leading Aircraftmen Shane Brown, left, and Brendon Bone, both aviation refuelers with 13th Squadron, attach a refueling hose to a ground reservoir while refueling a U.S. Air Force B-52H Stratofortress at RAAF Base Darwin, Australia, April 3, 2018. RAAF Darwin and members of 13th Squadron hosted bomber crews and support personnel during a week-long Enhanced Air Cooperation exercise, designed to increase resiliency, capability and cooperation between U.S. and Australian armed forces by increasing aircraft rotations and conducting combined military exercises and training in Australia. (U.S. Air Force photo by Staff Sgt. Alexander W. Riedel)