After you build the vehicle factory, buy a buggie. Once its finnished, just stand next to it and over time it will resupply you with ammo. I always thought that it was a good idea to have some buggies tag you while you moved around the map, just so you don't worry about ammo.
Or go near base, you get more ammo thant way too.And offiseman, I totally agree!You should always have at least 1 buggie with you, so you get infinite ammo.Only problem is that buggies are kinda weak, they die easily.
to beat stage 4 you need to build a base directly to the left of your resource mine then build a energy generator directly behind your base, then build two more generators one on each side of your base then build two supply stations on on both sides of your base then build one barracks to the left of your base build 4 rocket marines then 4 combat marines select them then move dem to both sides of the map so you can see enemies on the map as soon as they spawn then build a vehicle factory then build 3 buggies select the buggies and your men, move them to the right side of the man jut below the start of the hill build 8 marines of your choice and move to he left side of your base build 5 turrets on both sides of the map each side by side take strickman and your marines to the left side of the map and defend if all goes well you should have victory but keep your men alive by healing them.
uhhhhh this game is fun until level 4... then i always die on the 3rd or 4th wave of guys.... its rediculous, whoever made that game is stupid, it shouldnt be that hard until you get the last ability thing, the rangers. then it would be beatable. its far to difficult.... or at least make like, easy, medium, hard, expert.. i know plenty people who wouldnt even make it onto wave 4 on that level....