Two pilots and two other crewmembers were killed when their UC-35, a military version of the Citation 560, crashed and caught fire March 10 about half a mile short of the runway while on the approach to Miramar Naval Air Station in San Diego. Reported visibility was five miles in mist. The crew was returning from a “proficiency training” mission intended to help them maintain their flying skills. The 4-hour 30-minute flight took them from San Diego to Grand Junction, Colo., and back.