military hardware for people who think their coffee needs an armored escort.
means small transportable pressure vessels or armored units designed to be moved and deployed wherever the fight or the fuel is.
from the term splits into two lineages: logistics (portable fuel and gas tanks, dating to early 20th century industrial transport) and military slang for light, air-droppable armored vehicles developed for rapid deployment after WWII airborne warfare proved tanks could fly in, not just roll in.
m551 sheridan — us light tank, air-droppable, used in vietnam and panama
tetrarch light tank — british glider tank deployed at d-day, 1944
bmd-4 — russian airborne combat vehicle, parachute-deployable since 1970s
propane cylinder — the household portable tank everyone actually owns