first-line reserve

first fire mixture / first-fire mixture

inactive Reserve (Individual Ready Reserve [IRR])

first-line transport

deployment line; line of deployment (LD); line of departure

credible first strike capability

first aid facility

first aid kit

first echelon maintenance

first echelon medical equipment maintenance

first hand information

first impression report (FIR) (post exercise)

first lieutenant = (брит.) lieutenant

first light

first responder (emergencies)

first response

first response unit

First Sergeant (1SGT)

first watch

first-aid skills

individual first-aid kit (IFAK)

first lights

Petty Officer First Class (PO1)

Private First Class (PFC)

Sergeant First Class (SFC)

tactical first aid kit

first round fire for effect

medical kit / med kit / medi kit / first aid kit

medical pouch, med pouch, medi pouch, first aid pouch, medical pack

first iteration of fuel (the)

first gear

first stage fuel filter

first-hand observations