Sorry to be bumping this but I came across it on a google search and figured I'd throw my 2 cents in.

There are two versions of this patch the one shown and a circular which I have and will try to scan and post it if anyone is interested. I believe the triangle was the more common of the two. On the circular version it has the Additional text:

Air Force Flight Test Center

The Ghost Squardron

IIRC The latin is We aren't Seen, We aren't Heard, We fly at night.

Though the Squadron is now defunct it is still classified which is why you can't get any info on it.

People familar with the patch may also remember

Penser Hors Limites Ops Group