IRIS SCAN U.S. Army Pfc. Patrick Davis, left, and Staff Sgt. Joshua Tyree, right, shield an Afghan man's eyes from bright sunlight as Davis scans his iris with a handheld identity detection device during a combined clearing operation in Afghanistan's Ghazni province, April 29, 2012. Davis and Tyree are assigned to the 82nd Airborne Division’s 2nd Battalion, 504th Parachute Infantry Regiment, 1st Brigade Combat Team. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 686939-G-DGS06-922.jpg Photo Gallery