under one's own steam

своїм ходом (They’d set out from RAF Odiham under their own steam, the UK military lacking any aircraft large enough to fly them out to theatre. - ‘Operation Mayhem’, Heaney with Lewis, 2014)

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

paint a target on one`s own back

have a war under one's belt

forward line of own troops (FLOT)

Kosbies / KOSBs (King's Own Scottish Borderers)

King's Own Hussars

Queen's Own Cameron Highlanders

without its (own) means of initiation

BYOB (bring your own bottle / booze / beer)

bring your own liquor (BYOL)

steam catapult

steam supply

steam turbine

steam-powered catapult

steam extinguishing installation

carrier with an oil-fueled steam turbine power plant

steam turbine oil

volatility with steam

steam fog

Steam Deck

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

foot march under packs

hand-held under-barrel grenade launcher

restricted area (under military jurisdiction)

surveillance, under surveillance

under armor auxiliary power unit (UAAPU)

under arms

under barrel grenade launcher (UBGL)

under canvas

under command of

under cover of

under fire