Tech. Sgt. Zachariah Pock climbs a ladder to conduct post-flight checks on a C-17. Tech. Sgt. Zachariah Pock climbs a ladder to conduct post-flight checks on a C-17 Globemaster III engine during the mobility air forces exercise at Nellis Air Force Base, Nev., on Nov. 17, 2010. Pock is a crew chief with the 62nd Aircraft Maintenance Squadron at Joint Base Lewis-McChord, Wash. SHARE: Download: Full Size (0.03 MB) Credit: VIRIN: 301648-Q-TBX34-136.jpg Photo Gallery