VX-4, Air Test and Evaluation Squadron Four, (AIRTEVRON FOUR), commonly referred to by its nickname, 'The Evaluators', was a United States Navy air test and evaluation squadron based at Naval Air Station Point Mugu, California. Their tail code was XF, and they flew the McDonnell Douglas F-4 Phantom, and the General Dynamics F-16N Sea Viper. Their radio callsign is 'Vandy'
