Two California Highway Patrol Officers were conducting speeding enforcement
on I-15, North of MCAS Miramar. One of the officers was using a hand held
radar device to check speeding vehicles approaching near the crest of a hill.  The officers were suddenly surprised when the radar gun began reading 300 miles per hour. The officer attempted to reset the radar gun, but it would not reset and turned off.
Just then a deafening roar over the treetops revealed that the radar had in
fact locked onto a USMC F/A-18 Hornet which was engaged in a low flying
exercise near the location. Back at the CHP Headquarters the Patrol Captain fired off a complaint to the Marine Corp Base Commander.

Back came a reply in true USMC style:

Thank you for the message, which allows us to complete the file on this incident. You may be interested to know that the tactical computer in the Hornet had detected the presence of, and subsequently locked onto your hostile radar equipment and automatically sent a jamming signal back to it. Furthermore, an air to ground missile aboard the fully armed aircraft had also automatically locked onto your equipment. Fortunately the Marine Pilot flying the Hornet recognized the situation for what it was, quickly responded to the missile system alert status and was able to override the automated defense system before the missile was launched and your hostile radar was destroyed.

Thank you for your concerns.