VX-4, Air Test and Evaluation Squadron Four, (AIRTEVRON FOUR), commonly referred to by its nickname, The Evaluators) was a United States Navy

United States Navy

The United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U.S. Navy is the largest in the world; its battle fleet tonnage is greater than that of the next 13 largest navies combined. The U.S...

 air test and evaluation squadron based at Naval Air Station Point Mugu

Naval Air Station Point Mugu

Naval Base Ventura County Point Mugu or NBVC Point Mugu is a military airbase located in Point Mugu, Ventura County, California, United States. Due to realignment actions which occurred in 2000, the base is now part of Naval Base Ventura County , a consolidated organization that also includes...

, California. Their tail code

Tail Code

Tail codes are the markings usually on the vertical stabilizer of U.S. military aircraft that help to identify the aircraft's unit and/or base assignment and occasionally other information that is not unique. This is not the same as the serial number, bureau number, or aircraft registration which...

 was XF, and they flew the Grumman F-14 Tomcat and the McDonnell Douglas F/A-18 Hornet until their disestablishment in 1994.
VX-4 (Air Test and Evaluation Squadron 4) was established in 1950 at NAS Atlantic City as Air Development Squadron 4, primarily for the development of airborne early warning system (AWACS

E-3 Sentry

The Boeing E-3 Sentry is an airborne warning and control system developed by Boeing as the prime contractor. Derived from the Boeing 707, it provides all-weather surveillance, command, control and communications, and is used by the United States Air Force , NATO, Royal Air Force , French Air Force...

).