на чергуванні; при виконанні службового обов'язку
duty, off duty
duty, on duty
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
parachute duty
patrol duty
permanent duty station
principal duty
reconnaissance duty officer
return to duty (RTD)
routine military duty
special assignment duty
staff duty
submarine duty
tour of duty
be on TDY (Temporary Duty)