Where can I find Ricochet?

I’m trying to get my last Achievement in Halo 4, but I can’t seem to find a Playlist that has Ricochet in it…

Has it been removed, or am I just not looking in the right place?

Removed on Monday to make room for Heavies. According to this you can find variants of Ricochet in Proving Grounds, Multi Team and Action Sack.