first impression report (FIR) (post exercise)

post exercise discussion report

impression of firing pin

firing-pin impression

flight information region (FIR)

far infrared (FIR)

finite impulse response filter (FIR-filter)

first fire mixture / first-fire mixture

first aid post

exercise analysis report

final exercise report

Meteorological Terminal Aviation Routine Weather Report / Meteorological Aerodrome Report (METAR)

command post exercise (CPX)

field and command post exercise

logistical command post exercise

post exercise action

combined command post and field training exercise

command post and field training exercise

command post exercise

aiming post lamp / aiming post light

credible first strike capability

first aid facility

first aid kit

first echelon maintenance

first echelon medical equipment maintenance

first hand information

first lieutenant = (брит.) lieutenant

first light

first responder (emergencies)

first response

first response unit

First Sergeant (1SGT)

first watch