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)
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)
interior guard duty