Members of the 633rd Civil Engineer Squadron set-up a small shelter system during a Prime Base Engineering Emergency Force readiness challenge at Joint Base Langley-Eustis, Va., Oct. 25, 2016. This part of the training was instructed by the structures shop, the instructors showed them how to properly put up and take down the small shelter system. (U.S. Air Force photo by Senior Airman Kimberly Nagle)