"klicks". I could be wrong but believe the Navy still uses yards for gunnery, though. hey did fairly recently, anyway.
I don't have any issues with metric but it's just not the big deal that the whiners keep saying that it is. I can spot fractional heads, too (I used to be a lot better when I did it more). There really isn't all that much difference. It just takes a little education. The cost of switching isn't worth the price, though.