LISTEN UP U.S. Air Force Master Sgt. Richard Parker, the non-commissioned officer in charge of exercise support, conducts a tactical vehicle license certification briefing in preparation for Exercise 08-09 at the Joint Readiness Training Center on Fort Polk, La., Aug. 9, 2008. SHARE IMAGE: Download Image: Full Size (0.05 MB) Photo By: VIRIN: 808606-B-THT17-476.jpg Photo Gallery