Militarily, the GLCM was targeted against fixed targets—at the outer edge of its range, the missile's flight time with its subsonic turbofan was more than 2½ hours. The missiles were launched from an elevated launcher, with the missile ejected from its canister for about 13 seconds of solid rocket booster flight. The fins extended at 4 seconds, the air inlet and wings deployed at 10 seconds and the jet engine started at the end of the boost phase. Flying at low level, the missile was guided by TERCOM (terrain contour matching) to the target.