A C-17 Globemaster III flies behind another C-17 during Exercise Rainier War near Moses Lake, Wash., June 6, 2018. During the exercise, 20 C-17s from the U.S. and Australia performed actual container delivery system (CDS) and heavy equipment airdrops at the Rainier Drop Zone near Moses Lake, and simulated improved CDS, CDS and high altitude low opening personnel airdrops throughout the western United States. (U.S. Air Force photo by Senior Airman Tryphena Mayhugh)