Generally only take one resupply crate, if you want more just ask your fellow divers, also try to call down ammo when you are all bunched up together or just finished a objective, but dont be afraid to call it down just for yourself. Gentlemens rule: dont steal peoples stuff , thats pretty rude. If you are in a pinch or they call down a new set of equipment its fine to pick it up and use it, but in the former case dont forget to give their gear once you are done killing undemocratics with it. Oh and always check your reinforcements. Lastly never forget this golden rule: when in a firefight and all hope seems lost, CHARGE THE ENEMY AND CLOBBER ALL THOSE FREEDOMLESS BASTARDS INTO FERTILIZER WHILE YELLING SUPER EARTH PROPAGANDA!
have fun!