The Army has been on an as-of-yet unending quest for a true light tank or mobile gun capable of landing behind enemy lines alongside airborne troops. Just last year, the service canceled the M10 Booker — a light tank that never was. And that’s hardly the first of its weight class to end up in the Army’s boneyard — there’s the M56 Scorpion and the M50 Ontos, to name two. It hasn’t been since the M551 Sheridan that the service got what it needed out of a light tank, and even then, only kind of.