I simply don't understand the premise of the question - if they aren't in imminent contact with your guys the answer is either "nothing" or to arrange a visit by the B-52s since you have all the time you need. If they are, it's "everything in range which can start firing in the next 30 seconds". That's probably a couple of GPMGs, a couple of LMGs personal weapons, probably some 81mm mortars firing HE, maybe a half battery of tube artillery (again firing HE with VT fuses if you're lucky - no time for anything fancy) and if God really likes you a couple of fast jets with 500 or 1000 lb guided bombs.
The reality is that if you've suddenly discovered 5,000 of Terry Taleban's best infantry in your lap then if you try waiting for a more effective weapons system you're dead. Hit them with whatever you have and hope!