Don't understand this argument. A vet 3 blob of everything can delete stuff.
The thing is, 76mm have universal shells, unlike the 75mm, and have crazy rof with radio net. This tank is also basically a premium medium. The issue is that you are megacharging the USF roster by allowing them this option. This tank is way too powerful to be stock, especially combined with a CalliOP. The reason is that it deletes any pak40/rak counterplay. Consider this, you have 2-3 76mms and a CalliOP lategame. Your opponent has chosen to rely on double pak40s. You use the tactical support recon plane, spot the double pak40s, barrage them with CalliOP, then charge in with your premium mediums and infantry. This is way too powerful. If USF in live tries to do that, they'll have to use the 75mm M4s that are stock, which need to switch shells, adding a heavy micro and rof burden, as well as are significantly weaker against enemy medium tanks. 2-3 76mm M4s can easily beat 2 P4Js, while 2-3 75mm M4s will probably lose.
Theoretical situation, sure, but the point is the 76mm is too good a vehicle to be stock, especially since it would allow USF to get other powerful doctrine picks such as Tactical Support.
Please don't turn pathfinder beacons into forward retreat points, the Soviet Airbourne ones are already borderline game breaking abuse in 2v2. Just limit them to 1-2 on the field at all times and they're fine.