Bottomless Clip does fit, very well, and I was thinking of Gunmen as well. Before I go any further I'm going to point out I never read the comics, I only watched the show so these suggestion might not sync up with everyone else's view points. I couldn't stand comics when I was younger because I could only get 16 pages at a time and then I had to wait a month. Why would I spend 2 bucks on a comic when I could spend 3 bucks for another GI Joe (I've still got about 200+ figures boxed up in my garage)?
My first thought is there should be a fast focus quality, allowing characters to gain a new focus or forte for every 3 ranks they gain in a focus skill. I recall that nearly every character could drive any vehicle that was available. Unfortunately there is nothing in the book like this.
What about Big Budget? GIs had the best gear, rifles, machine guns, grenades, and all the tanks, planes, ships and jeeps you could stand. Remember The General? http://www.yojoe.com/vehicles/90/general/
I can only remember one episode where they couldn't get all the gear they wanted and that was because a member of Cobra (must of been Zartan) infiltrated the government to cut back their funding.
Mmmmmmmmmm, the General. I've been thinking about that bad boy all day and I'm switching to Driver, maybe Driver/Infiltrator. I'm going crack open the book and see if I can build myself a Mobile Battle Bunker. http://www.yojoe.com/vehicles/90/mobilebattlebunker/