killing spree at The Ark

1st i started Campaign : The Ark .. got off the pelican with a sniper rifle, got up to the 1st area took off a few brutes with a sniper rifle .. i waited 3 minutes for my team mates to clear the sector .. they cleared the sector successfully .. we proceed .. on the way i picked up a bubble shield which may come in handy on the 2nd area .. a jackal was on top of that Anti Air Battery .. no choice gotta take it out .. so wasted 13 carbine shots on it because the 1st shot didnt kill it == after jackal got pinned down by me .. i switch back to sniper rifle and took off the next few group of brutes .. till the last moment it sux .... 2 hunters got dropped off the Phantom & they started charging towards my team & killing them .. they kill 2 of my marines .. i snipe headshot .. shoot here & there also no use .... carbine rounds burn finish already .. no choice b4 my shields were drained completely .. i went back to the grav lift on the 1st area & pull out the plasma turret .. walk back to 2nd area & cleared 2 hunters then later around 2 minutes my last marine proceeded up the hill with me & we cleared the green armored brute & a few grunts .. then down the desert there were brutes & grunts guarding vehicles .. this was another fun part because there were 3 more men there , i took off the next brute & my team rammed the grunts ...... mounted a few Mongoose & we proceeded through the desert taking off the rest of the covenant forces including vehicles .. i manage to raid a Ghost & used the booster ... we took off the AA wraiths .. boarded scorpion with the rest of the backup & we proceed through the cartographer .. then suddenly a scarab was launched .. it blew right through the desert & it was firing its cannons & the plasma .. everyone suppported me & the whole team + 3 scorpions took down the scarab with ease.. thats the end for today