How do you get credits fast on halo reach

Well it sort of is cheating but u go in forge and put a repawn point down. then u put a kill ball on top of it and kill yourself. you will respawn in the kill ball. do this 4 3-5mins and u should get about 700 credits or so if u dont have xbox live. if u do then u will have to do the campaign 4 a bit and get commendations and put skulls on and youll get bout 1500 credits!! thats it from omolikescats