Air Force Tech. Sgt. Robert Mathis works range space issues. Air Force Tech. Sgt. Robert Mathis (left) works range space issues while Master Sgt. Craig Hillsman gives a "cleared hot" to attack call to an incoming A-10 Thunderbolt II aircraft during a training exercise at the Nevada Test and Training Range on May 22, 2005. Hillsman and Mathis are Joint Terminal Attack Controller Qualification Course instructors with the 6th Combat Training Squadron at Nellis Air Force Base, Nev. The controllers assist ground forces commanders by clearing aircraft to attack authorized targets. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 119988-D-TJH17-027.jpg Photo Gallery