THREAT SCAN As seen through a night-vision device, U.S. Air Force Staff Sgt. Josh Martin scans for threats during a goggle training mission with Afghan airmen in Kabul, Afghanistan, March 13, 2014. Martin, an Mi-17 advisor, is assigned to the 438th Air Expeditionary Wing, NATO Air Training Command Afghanistan. SHARE: Download: Full Size (0.04 MB) Credit: VIRIN: 376559-J-HPE20-397.jpg Photo Gallery