The real skill is to push on and on no matter what the enemy is holding wether an M249, CS5, MK153 SMAW or has a tank, AA, or an attack heli. It is crossing the limit and raising the stakes high about being in battle and have an excellent squad work your team mates are supporting and you have the tactics of the match going where to ambush and all those things, and i believe thats the time you conquer all the things which require to reach the top.