Cpt. Matthew Purcell checks aircraft instruments before take-off May 31, at Nellis Air Force Base, Nev. Purcell was participating in the Joint Forcible Entry exercise, during which pilots’ flying skill and decision making was tested in the execution of various missions in a contested environment. Purcell is a 57th Weapons Squadron C-17 Globemaster III pilot. (U.S. Air Force photo/Airman 1st Class Joshua Kleinholz)