one-handed weapon

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

even-handed approach

two-handed riot baton

fight single-handed

single-handed

single-handed operation

Left-Handed Circular Polarization (LHCP)

Right-Handed Circular Polarization (RHCP)

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

be on one's high horse / get on one's high horse

one-shot weapon

single-shot-one-hit weapon

grasp the pistol-grip (of one’s weapon)

nuclear weapon; atomic weapon

weapon-counter-weapon pendulum

Wunderwaffe (нім.) (wonder-weapon / miracle weapon)

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-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