AIR DEFENSE U.S. Marine Corps Sgt. Maj. Bryan Battaglia, left, senior enlisted advisor to the chairman of the Joint Chiefs of Staff, talks with U.S. Army Command Sgt. Maj. Jose Villarreal about air defense during a visit to 7th Air Force on Osan Air Base, South Korea, Feb. 6, 2015. Villarreal is the senior enlisted advisor to the 35th Air Defense Artillery Brigade. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 779352-R-BVM77-605.jpg Photo Gallery