Unmanned Aerial System

Air Force Reserve Command

Anti-Aircraft Artillery, e.g. Russian ZSU-23

Air-to-Air Missile

Air-to-Air Refuelling

Air Combat Command

Air Combat Manoeuvring

Air Combat Manoeuvring Instrumentation - Aircraft telemetry information system to locate aircraft in aerial combat, has been replaced by the newer NACTS system

As opposed to passive - a radar radiating or in 'active' mode as opposed to standby or passive mode

Air Defence Initialisation Zone