Not that you will need to, but just in case: Always know where cover is nearby. Not a tent with thin cloth walls (that's concealment and won't stop shrapnel/bullets), but real cover: A hole in the ground, an armored vehicle, a pile of sand bags...something solid. Start noticing these things around you in training and if you ever go to the big sand box you will be prepared. A bush won't stop anything, but a tree will. Clean your weapon a lot. Keep the bolt lightly oiled too...especially in the desert. Always know where you are on a map. Save your money in the bank while others are out partying. One day, you may want to buy something substantial (like a house or land) and you'll have the money instead of having drank it all up.