Civilian J-35 Viggin

I work at Seymour Johnson AFB, NC. Today i saw a Saab J-35 Viggin, painted dark green overall and had a N tail number (N111XP) and ATAC on the tail. It had a sharks mouth on the nose also. Tried to find some info on the web about the company (possible future employment oportunity). Does anyone have any info on this aircraft or the company? Any info would be appreciated. Thanks