Tech. Sgt. Joseph Herrera signals other crew chiefs and loadmasters. U.S. Air Force Tech. Sgt. Joseph Herrera, a crew chief with the 64th Expeditionary Helicopter Maintenance Unit, signals other crew chiefs and loadmasters as a winch system drags an HH-60 Pave Hawk helicopter onto a C-17 Globemaster III aircraft at Joint Base Balad, Iraq, on July 12, 2008. Herrera is deployed from Davis-Monthan Air Force Base, Ariz. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 131479-F-BML79-575.jpg Photo Gallery