Ok so after i defeat the pinger and it says regroup at the vehicles i go to them and it wont advance to a new check point or anything they just sit there. Is anybody else having this proble or know how to fix it ive tried restarting twice so i dont know whats up.

This same issue happened to me on another mission, they just stood there. It's a glitch when they think not every enemy is killed and you can still make your threat meter go up by firing shots in a certain area of the map (specific). All you can do is quit out, and re-do the mission and it will work. Its annoying but its not a big set back. Infact when I re-did it I found stuff I didn't the first time.

Edit: I know you said you restarted twice but I think that's all you can do. Maybe try different tactics? Thats what I did, I stayed around the guys to protect them and killed the enemies from there instead of running off on my own.

Alright thanks

I had the same problem and there was another topic about this same glitch.
I first of all tried to restart the checkpoint and did that 5 or 6 times and still no success.
After leaving it for the night I came back to the game and decided to redo the whole mission again.
This time it seemed to work and was able to move on from this checkpoint.
So i guess you will have to try redoing the mission as suggested.
Let us know if it works.

Ben

you probobly didnt kill everyone another thing when you try to get into a vehicle as soon as they arrive and the option is availible a marine will call you over and i didnt hear him the first time so i waited for about 2 minutes finally got out the marine talked to me and i finally got it done

I got stuck on the mission where you had to get the first DNA sample from the alien... I killed the alien but the corpse fell off a platform where I killed him and got stuck half way down the side of the platform. I could see the damned DNA I needed but couldn't reach it. Had to do what was suggested here, ie quit out and redo.

yeah i just restarted and it worked

Yep i had the same prob. but only on supersoldier. i went through my first time on veteran and had no problems. but then i attempted to go through on supersoldier and it wouldnt let me past that part i reset my console and everything, nothing worked. so i restarted the entire mission and it worked. so i guess i didnt finish something or had that one thing that glitched and messed everything up. so if anyone else has this prob just restart the mission completely it should solve the problem

Btw. the fastest way to kill the big alien is to cloak up and run up to it through 4 or 5 c4 on the red thing on its back and go into armor mode and KA-BOOM!!!! it will fall right there. done. hope this makes it go faster and easier. and i kno this works on supersoldier so i should work on any difficulty