heavy-duty

duty, off duty

duty, on duty

heavy duty follower spring

continuous heavy-duty service

heavy-duty freight car

heavy-duty hoisting equipment

heavy-duty multiple disk steering clutch

heavy-duty pavement

heavy-duty transfer case

heavy-duty fire tender

heavy-duty test

automatic heavy barrel rifle / heavy barrel automatic rifle

heavy-armored (heavy armoured)

heavy-weight torpedo / heavy weight torpedo (HWT)

active service/ duty

airlift duty officer

combat alert duty

combat duty assignment

command billet / duty / installation

command duty

demolition duty

duty officer

duty roster

entry on active duty

fighter duty officer

foreign duty

full time military duty

guard duty

inactive duty training (IDT)

interior guard duty

medical duty

off duty