Senior Master Sgt. Jason Hood, a 571st Mission Support Advisory Squadron helicopter crew chief and air advisor, advises a Honduran Air Force airman on the proper installation of a radar altimeter indicator at Tegucigalpa, Honduras, Feb. 3, 2012. Radar altimeters are a component of terrain avoidance warning systems, warning the pilot if the aircraft is flying too low or if there is rising terrain ahead. (U.S. Air Force photo/Tech. Sgt. Lesley Waters)