Not military, but a State Department contract I was on in Afghanistan purchased about a dozen of them to mount on Barrett 95s or 99s we got in 2007 to be used as counter-IED weapons. The rifles showed up for but had no optics and the project manager solicited my input for what to get. I suggested the Super Snipers and I think GG&G rings, provided contact info for a few vendors so the company could bid them out, and the scopes and rings showed up and couple months later. Once our armorer got the scopes mounted, the Barretts got sent out to our sites country-wide, sometimes co-located with military training teams (some of our Bushmaster M4s also got 'borrowed' by military folks from time to time as well). I'll see if I've got any photos of the Barretts with the Super Snipers.
The pallet the Barretts came on also included shit ton of de-linked 1940s head stamped .50 ball.