It would most definitely be appreciated if an "Unlimited Combat Support" option could be made available in a trainer.
I was expecting the number of calls to be effectively unlimited - the limiting factor being the time between calls. To have such stringent limitations is fairly rubbish. You're not going to start a spearhead assault, give your forward operator freedom of target selection, but then tell him that he can only call in a single strike... "Sorry, the rest of the ammo doesn't arrive 'till Tuesday. SecNav's vanity cabinet took up too much room."