Sgt. Kevon Campbell, a combat medic with the 82nd Airborne Division's 1st Brigade Combat Team, uses a Handheld Interagency Identity Detection Equipment, or HIIDE, system to check the identity of an Afghan villager against a database of known insurgents, April 8, 2012, in southern Ghazni province, Afghanistan. The equipment stores an image of the person's iris as well as his fingerprints.