one shot one kill veteran?

I did that bit, by hiding in one of the little shack things around the place, I was in one of them in such a way that no nades could kill me. If any were close I threw them back though. But many piece of adivce don't stay out in the open and use you're claymores.
Hope this helps =)

What I did was planted all of my C4 in the field where the first soldiers come. I'd wait until they came, shot one so they would go prone, and then Detonate them. Put some C4 there so life is easier. Then I went to the bumper cars and put some claymores around there. Make sure you put any behind there, since this is where you will hang out. After putting all of your claymores, go to the back of the Bumper Cars, and jump up on the track. Now this is the hard part, see the fences on the Bumper Cars, on the perimeter, and see the wooden fence? Go behind the fence on the bumper cars, and go prone (so the soldiers will come) then just crouch. It's a great sniping spot, and the bullets will rarely hit you since the metal fence is in the way. If you seem to get low on health, jump off, and go prone, regenerate, then hop back to the spot you were in. Make sure you have a machine gun also, as you will run out of bullets. There is an AK-47 near where MacMillan is, behind the cars.

It may take a few tries, but it works.