Back in the, want to say early 90's I had a set of action figures. They were basically a GIJoe rip-off, but they were slightly taller than Joes. They were military themed and came with a giant mechanical back-pack that would transform into a vehicle where the figure could slide in underneath. I had the set of 3, whose backpacks could combine into a jet, and a single of 5 whose backpacks could combine into a tank. There was also a 3rd set, but I can't remember what it combined into. I don't think there were any villains from this line, just the 3 sets of military figures. If anyone could help me remember what this was, is would appreciate it. I have been searching the internet for weeks, and am finding no results, it is driving me crazy.