How do you get a lot of credits fast on halo reach

You can boost challenges with friends, OR do look up SWORD:LASSO do that but run straight for the target designator and wait for a checkpoint use the target designator and revert to last saved point over and over your commendations will get you at least 70k+ credits within 1 hour (Cannot reset commendations yet; its been leaked you can reset them in the near future).... DO NOT EVER TRY TO EARN CREDITS BY CUSTOM GAMES!! that will waste your time. DO NOT CREDIT FARM IT WILL GET YOU BANNED!! Do challenges and earn commendations, don't hack your account and do NOT EVER try to do anything stupid that can get you banned!!