Tech. Sgt. Mike Smith, loadmaster, stands by a C-17 Globemaster III prior to joint forcible entry exercise on Nellis Air Force Base, Nev., Dec. 10, 2016. JFEX is meant to challenge aircrews and ground combat units involved, and is an evaluation of the mission leadership's ability to efficiently integrate ground forces and dissimilar aircraft into one "strike package." (U.S. Air Force photo by Airman 1st Class Kevin Tanenbaum)