A 40th Flight Test Squadron F-16 Fighting Falcon sits in the anechoic chamber after completion of the initial round of testing simulations on the new M-7 software upgrade Oct. 30, 2014, at Eglin Air Force Base, Fla. The M-7 software package will provide multiple advanced capabilities to the aircraft. The anechoic chamber is a room designed to stop reflections of either sound or electromagnetic waves. The room is insulated from exterior sources of noise. The room is part of a facility that allows testing of air-to-air and air-to-surface munitions and electronics systems on full-scale aircraft and land vehicles prior to open-air testing. (U.S. Air Force photo/Samuel King Jr.)