The FAA ordered $10 million of additional CM-300 Ultra-high Frequency (UHF) radios and equipment from General Dynamics C4 Systems to upgrade communication capabilities between air traffic controllers and military aircraft. The FAA said the order is part of the $102 million FAA UHF Replacement Radio contract originally awarded to General Dynamics in 2002. The CM-300 radios transmit and receive flight path, tracking and related navigation information between military aircraft in-flight and air traffic control personnel on the ground. General Dynamics said its CM-300 radios are also used for air traffic control communications at U.S. military air stations and ranges in fixed-site and remote locations.