active air defense

active layered theatre (ballistic) missile defense (ALTBMD)

active antimissile defense

active ballistic missile defense

active satellite defense

active defense

active air reserve

Air Force Air Defense Command

perimeter defense (all-around defense)

beach defense mine / beach-defense mine

aerial refueling / air refueling / in-flight refueling (IFR) / air-to-air refueling (AAR)

air combat capable helicopter / air-to-air capable helicopter

air support field pack, field pack air support, airborne / para (air support) / Pathfinder Bergen

active camouflage

active combat area

active component

active component headquarters

active counterintelligence measures

active countermeasures

active deception measures

active decontamination

active defenses

active denial system

active infrared (IR) guidance system

active material; fissile material

active military service

active missile defence

active public information policy

active radar homing (ARH)

active service/ duty

advanced active homing technique

entry on active duty

semi-active homing guidance system