When helos are damaged they leave the battle. That's the way the game works.
Maps ARE interchangeable between MBT and WW2. Always have been and always will be. ( However, don't try to put a map from a newer version of the game into an older versions of either game. When WinSPww2 is released it will load maps made in WinSPMBT just fine but don't try to run a map made with WinSPMBT in a DOS version of SPWW2 or you'll see some funny blank spots )
Don
__________________
"You are never to old to rock and roll if you are too young to die".--- What do you expect to be doing when you are 80?