Are there any sites out there using Perforce on a government project? I'm trying to push Perforce as an SCM solution for a government contract I am working on, but apparently anything that is not on the government software 'approved list' can't be used, regardless of technical merit.

The only SCM products that I know of which are on the list are PVCS and Endeavor. I was wondering if anyone else has managed to use Perforce in a government project and how they managed to bypass the 'approved list' hurdle.