A hack of the Apocalypse World engine for tactical future combat scenarios in the universe of "Aliens", in which players portray Colonial Marines. NOTE: This is a playtest kit version 2.5. Additional information here.
Don't get bogged down in planning! This is the classic problem with tactical games: given the high stakes of combat, players will (understandably) try to plan for every last contingency, which can lead to sessions that are 3 hours of planning and discussion and one hour of action. I know... I ran other war RPGs for years and this was SOP - which is why The Regiment gives you tools to skip over all that planning and cut right to the beginning of the action.