I said coming soon didn't I? The M7A6E3 is a proof-of-concept vehicle that was put into service. Back in the 1970s, UDC inherited all military equipment from the collapsing Republic of Cuba. Their mainstay was Ardent tanks with oscillating turrets. UDC used them for a bit, and then retired them. Some were sold off, but most had their turrets removed and were turned into support vehicles. Only recently, someone had the idea of taking these turrets, putting them on a M7A6 chassis, arm it with the new M4A1 gun, and show it off to brass. It proved itself airborne-capable, as this was a requirement of the M7 program. It was put into service as M7A6E3, as the E1 was the 76mm version, the E2 the 105, and now the E3, with the 120. Armor is the same as the E2. AG7 for parachutes.