on halo 3 on xbox live i have abunch of experience, like 140, and i am a leitenant grade 2, and if i get my highest skill to level 20, go to captain, i know this. BUT in slayer my skill is 15 and i can't level up. i have gotter MVP on the winning team, and i didn't level up. i played with my friend and he had 6 kills and i have 24 kills, and he leveled up, and i didn't. I NEED TO KNOW HOW I CAN LEVEL UP QUICKER. i won many games with lots of kills but i wont level up .. what do i do..?