first-hand observations

rocket-sonde observations

space observations

first fire mixture / first-fire mixture

first hand information

hand in hand

hand-to-hand combat

hand-to-hand fight(ing) (HTH/H2H)

credible first strike capability

first aid facility

first aid kit

first echelon maintenance

first echelon medical equipment maintenance

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

first-line reserve

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)