The Boeing F/A-18E and F/A-18F Super Hornet are twin-engine, carrier-capable, multirole fighter aircraft variants based on the McDonnell Douglas F/A-18 Hornet. The F/A-18E single-seat and F/A-18F tandem-seat variants are larger and more advanced derivatives of the F/A-18C and D Hornet. The Super Hornet has an internal 20 mm M61 rotary cannon and can carry air-to-air missiles and air-to-surface weapons. Additional fuel can be carried in up to five external fuel tanks and the aircraft can be configured as an airborne tanker by adding an external air-to-air refueling system. Designed and initially produced by McDonnell Douglas, the Super Hornet first flew in 1995. Low-rate production began in early 1997 with full-rate production starting in September 1997, after the merger of McDonnell Douglas and Boeing the previous month. The Super Hornet entered fleet service with the United States Navy in 1999, replacing the Grumman F-14 Tomcat, which was retired in 2006; the Super Hornet has served alongside the original Hornet. The Royal Australian Air Force (RAAF), which has operated the F/A-18A as its main fighter since 1984, ordered the F/A-18F in 2007 to replace its aging General Dynamics F-111C fleet. RAAF Super Hornets entered service in December 2010. In February 2023, Boeing announced plans to end production of the Super Hornet in 2025. Development Origins The Super Hornet is a redesign of the McDonnell Douglas F/A-18 Hornet. The wing and tail configuration trace its origin to a Northrop prototype aircraft, the P-530, , which began as a rework of the lightweight Northrop F-5E (with a larger wing, twin tail fins and a distinctive leading edge root extension, or LERX). Later flying as the Northrop YF-17 "Cobra", it competed in the United States Air Force's Lightweight Fighter (LWF) program to produce a smaller and simpler fighter to complement the larger McDonnell Douglas F-15 Eagle; the YF-17 lost the competition to the YF-16. The Navy directed that the YF-17 be redesigned into the larger F/A-18 Hornet to meet a requirement for a multi-role fighter to complement the larger and more expensive Grumman F-14 Tomcat serving in fleet defense interceptor and air superiority roles. The Hornet proved to be effective but limited in combat radius. The concept of an enlarged Hornet was first proposed in the 1980s, which was marketed by McDonnell Douglas as Hornet 2000. The Hornet 2000 concept was an advanced F/A-18 with a larger wing and a longer fuselage to carry more