Experience can be earned by playing in online game modes such as: Team Infinity Slayer, Big Team Infinity Slayer, Regicide, Flood, Capture the Flag, Dominion, and any other multiplayer game modes. You can also earn EXP by playing Spartan Ops missions. I am not sure whether or not you gain EXP by playing Campaign (I got the game when it came out and did not gain EXP by playing Campaign).
You win games to earn EXP.
to get it, you have to have 7 exp in a playlist on the seventh of the month. on the seventh, try going into something you dont play much and earn 7 exp.
you go up exp by winning and lose exp by quitting
you need to have 100 exp and 10 skill level to become a lieutennant (officer) on halo 3
if you lose too much on a ranked playlist in matchmaking you can lose exp
100 exp. and a skill of at least 10
Go to Halocharts.com to see
keep doin matchmaking.
yes if the exp goes under the exp that you needed to go up a grade u will be degraded
I expect Bungie to keep the extras from halo 3 and move them to reach. So, to answer your question yes I think they will have double exp. weekend in reach.
no you can not get exp in the battle frontier in Pokemon plat
Grifball is a Double EXP Weekend playlist on Halo 3 matchmaking. It resembles football, but with bombs, swords, and Gravity Hammers! Grifball can be played in Halo 3's online multiplayer whenever it is featured as a Double EXP Weekend playlist.