основний обов'язок
duty, off duty
duty, on duty
principal attack
principal military requirement (PMR)
principal position
principal reserve
principal
Principal Subordinate Command (PSC)
principal direction of fire (PDF)
principal distribution depot
principal currency / reference currency
world map of principal aeronautical features
principal motion
principal subordinate commander
principal longitudinal axis
principal direction of fire
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