випробування у важких умовах роботи
duty, off duty
duty, on duty
heavy duty follower spring
continuous heavy-duty service
heavy-duty
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
automatic heavy barrel rifle / heavy barrel automatic rifle
heavy-armored (heavy armoured)
heavy-weight torpedo / heavy weight torpedo (HWT)
test heavy bomber
shear test / shearing test
stall test / stalling test
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)