all for one and one for all / one for all and all for one

one-way UAV / one-way attack UAV (OWA UAV)

all-wheel drive / all wheel drive

observation and fields of fire, avenues of approach, key and decisive terrain,obstacles, and cover and concealment (OAKOC)

fight one's way into the target and out

swift and flexible changes from one formation to the other

commission, to resign one’s commission

complete one's tour

force one's way

hoist / strike one's flag

inch one's way forward

one day’s supply

one-man turret

one-piece

one-piece base

one-shot weapon

one-time report (on status of equipment etc.)

one-time report

one-up

overstay one's leave

prescribed range (running-time on one fuelling)

push one's way

reverse one's field

strike one's flag

tighten one's hold

wet one's stripes

win one's epaulets

celebrate (one's) stripes

give away (one's) position

lie upon one's arms

single sap with one parapet

blow (one's) cover

condition one