one or both flanks

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

roll up the hostile flanks

Both

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

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

hundred-per-cent zone (one-hundred-per-cent zone)