https://muvluv.fandom.com/wiki/Tactical_Surface_Fighter
Senjutsuki (戦術機, "tactical fighter"), or senjutsuhokousentouki (戦術歩行戦闘機, "tactical walking fighter aircraft"), are large bipedal machines, and are a primary weapon system used to combat the aliens known as the BETA in the Muv-Luv Unlimited and Muv-Luv Alternative