that is spelled right, and military based weapons like mines, and different types of grenades would be a cool addition since we are most likely going to be able to access tanks. unless mounted I do not see miniguns being any useful, and definitively anti aircraft weapons would be a really good addition otherwise taking out jets would be next to impossible.
a SAM rocket launcher like in san andreas would help when dealing with jets, and as a counter measure jets should be able to release infrared flares except there would be a 15 second delay after each use. like in battlefield 3 that would make a nice addition to gta 5.
i mean because lets face it, we all know that there will be those helicopter, or jet whores who will fly around the heli/jet spawn and rape everyone, and blow up all air vehicles that appear, it would be nice to be able to counter those QDs.
but we should have flares in as to not completely discourage people from using jets or choppers.