Army Reserve Staff Sgt. Clifford Arrington, an information technology specialist, assigned to Defense Information Systems Agency, Army Reserve Element, 335th Signal Command (Theater) assembles a M16A2 rifle during a "Mystery Event" of the command's 2017 Best Warrior Competition at Fort Huachuca, Arizona, March 28. (Official U.S. Army photo by Sgt. 1st Class Brent C. Powell)