go on active service

separate from active service / the service

active military service

active service/ duty

active list service

active commissioned service

active enlisted service

active Federal service

active service

active service credit

casualties due to active service

separate from active service

branch (military/service branch, armed service)

Y service (Y-service) / Y-station

regional meteorological service/ regional weather service (RWS)

emergency service / emergency operations service

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 layered theatre (ballistic) missile defense (ALTBMD)

active material; fissile material

active missile defence

active public information policy

active radar homing (ARH)

advanced active homing technique