U.S. Navy Lt. Eduardo Castellanos uses a Dismounted Soldier Training System to prepare for deployment during Operational Contract Support Joint Exercise 2015, March 16, 2015. The exercise involves roughly 1,000 Soldier, Sailors, Airmen, Marines, civilians and coalition partners. Castellanos is a contract specialist and supply corps officer with Naval Support Systems Command Fleet Logistics in Puget Sound, Wash. (U.S. Air Force photo by Staff Sgt. Veronica Montes)