From the reports that I've read it sounded like the 150 was VFR and climbed into the path of the F-16 at 1,200 feet. ATC notified the F-16 of an unidentified target ahead of him and on an opposite track. I was wondering if it is standard practice for a military aircraft to have its radar on and if so wouldn't the F-16 have seen the plane ahead or was it too low to clear the ground clutter?