The Grumman F-14 Tomcat is a twin-engine, variable sweep wings capable of supersonic flight. The aircraft is crewed by a Pilot and a Radar Intercept Officer who share the tasks of navigation, Navy and the Islamic Republic of Iran Air Force only. The name "Tomcat" is said to come from the call-sign used by Vice Admiral Thomas Connolly which conformed to the USN tradition of giving Grumman aircraft feline names.