It must be the veteran knife combat badge.
At the old days, you need to kill 7 in a round to have it. I tried for the basic knife combat badge. But I failed all the time. After a month. my knife kills sufficed to get the veteran. I played Strike at Karkand and Sharqi Pennisula for over a month. My hands shakes when I killed no. 6. When I eventually got it, I jumped up and yelled.
Just like you set a target, you try your best to get it, but it is very difficult, and eventually, you get it.
At the old days, you need to kill 7 in a round to have it. I tried for the basic knife combat badge. But I failed all the time. After a month. my knife kills sufficed to get the veteran. I played Strike at Karkand and Sharqi Pennisula for over a month. My hands shakes when I killed no. 6. When I eventually got it, I jumped up and yelled.
Just like you set a target, you try your best to get it, but it is very difficult, and eventually, you get it.