Your going to hate me, well, by the end of the post you will. I saw this thread and thought I'd see what all the hoohah was about, and I was inclined to agree with you guys until 5 minutes ago... I mean I thought getting veteran knife would be near impossible, as I barely got the basic one before, but now, Im thinking its really easy to get knife kills.
Reason being I got 7 in 5 minutes. Yes your going to hate me ! I thought I'd give it a go, see if I could get it and, yeah, I did.
How you ask? Strike at Karkand. The first base in and with a UAV going. Wait down the side street furthest away from the American incursion, nearest the second MEC base and wait. when you see them heading towards the base, run around the two corners and just click repeatedly until badge is earned. They dont really tend to watch their backs and there are lots of chances to get ladder kills. I got about 8 in the end, I didnt count, and I used the MEC Support Kit, with the RPK.
Good luck to those who still need it.