Yep, pretty sure all except maybe the Talon are available as 1/72 scale die casts and some are probably available as 1/100/ 1/144 scale die casts too. The Amercom cheapies or ex Fabri magazine giveaways are better value for money for what you are doing.
Most of those should be available as 1/144 plastic scale kits if you are so inclined. Revell do the B-2, the A-10 and the Apache:
http://www.revell.de/en/product-search.html?key=scale&value=1%3A144&cHash=1f9dc4400ad71ecdc95c4b7e37a41ad6Dragon do various models of the Blackhawk. There's an obscure Japanese resin manufacturer of the T-38 Talon available through Hobby Link Japan. It looks like an easy build:
https://www.hlj.com/product/KADMMFT-027/AirIn 1/285 or 1/300 the A-10 is available from a variety of manufacturers, like Heroics and Ros, Davco (IIRC) and GHQ as are the Apache and Blackhawk. The other two you would probably have to look at resin through the likes of Shapeways, although if an F-5 would suffice for the Talon then those are available in metal from the above manufacturers.
At one point we had 1:35ish scale wood M1s and Bradleys we used for 'rehearsals' before missions. Smaller ones would have really detracted from the purpose of doing it. 
I used to carry the old Airfix 1/32 soft plastic British Infantry in my pack for orders groups. Marked the helmets in different colours to represent different teams within the section and felt tipped pen to mark out the team numbers. Bloke I knew, who was a tankie in Vietnam told me he had a troop's worth of Airfix Centurions he used in a similar manner.