This is an Israeli Aircraft Industries Kfir C-2.

Thanks for the info, Paul - I had about three guesses as to what this was and they were all wrong!

Who is ATAC, as listed on the tail?

http://www.atacusa.com. Company that provides tactical aircraft services to the military.

W.R.T ATAC providing an air order of battle training environment to such entities as the Marine Corps Mountain warfare Training Center located on the east side of the Sierras, Central California: The DoD now buys this service whereas a number of years ago this training environment was provided by (in this case) the Nevada Air National Guard (NevANG). The training sword, as it were, was double-edged. The Marines and the NevANG pilots/ Tac reconnaissance personnel, and other groups were all involved and became very proficient in their rolls. Now, DoD throws $$$ at the requirement and the armed services comes up a whole lot more short on training. Stupid! But, ATAC makes out like a bandit ... no pun!