LGM-30G Minuteman III ICBMICBM LGM 30 Minuteman display model. LGM 30G Minuteman ICBM model. The Minuteman weapon system was conceived in the late 1950s and Minuteman I was deployed in the early 1960s. Minuteman was a revolutionary concept and an extraordinary technical achievement. Both the missile and basing components incorporated significant advances beyond the relatively slow reacting, liquid fueled, remotely controlled ICBMs of the previous generation. From the