When you are playing xbox live and its 1 on 1 objective. I got something that will help you out. Start out as a luitenate on either team. Then throw down all the ammo you can. Then go to change class and choose medic. Then blow yourself up. And when you come back to life ammo thaty you threw down as a luitenate will be their and you are now a medic. So you have full ammo and medi-packs.