on 29 November 1995. Initial production on the F/A-18E/F began in 1995. Flight testing started in 1996 with the F/A-18E/F's first carrier landing in 1997. Low-rate production began in March 1997 with full production beginning in September 1997. Testing continued through 1999, finishing with sea trials and aerial refueling demonstrations. Testing involved 3,100 test flights covering 4,600 flight hours. The Super Hornet underwent U.S. Navy operational tests and evaluations in 1999, and was approved in February 2000. With the retirement of the F-14 in 2006, all of the Navy's combat jets have been Hornet variants until the F-35C Lightning II entered service. The F/A-18E single-seat and F/A-18F two-seat aircraft took the place of the F-14 Tomcat, A-6 Intruder, Lockheed S-3 Viking, and KA-6D aircraft. An electronic warfare variant, the EA-18G Growler, replaces the EA-6B Prowler. The Navy calls this reduction in aircraft types a "neck-down". During the Vietnam War era, the Super Hornet's roles were performed by a combination of the A-1/A-4/A-7 (light attack), A-6 (medium attack), F-8/F-4 (fighter), RA-5C (recon), KA-3/KA-6 (tanker), and EA-6 (electronic warfare). It was anticipated that $1 billion in fleetwide annual savings would result from replacing other types with the Super Hornet. The Navy considers the Super Hornet's acquisition a success, meeting cost, schedule, and weight (400 lb, 181 kg) below requirements. Improvements and changes The Block II Super Hornet incorporates an improved active electronically scanned array (AESA) radar, larger displays, the joint helmet mounted cueing system, and several other avionics replacements. Avionics and weapons systems that were under development for the prospective production version of the Boeing X-32 were used on the Block II Super Hornet. New-build aircraft received the APG-79 AESA radar beginning in 2005. In January 2008, it was announced that 135 earlier production aircraft were to be retrofitted with AESA radars. In 2008, Boeing discussed the development of a Super Hornet Block III with the U.S. and Australian military, featuring additional stealth capabilities and extended range. In 2010, Boeing offered prospective Super Hornet customers the "International Roadmap", which included conformal fuel tanks, enhanced engines, an enclosed weapons pod (EWP), a next-generation cockpit, a new missile warning system, and an internal infrared search and track (IRST) system. The EWP has four internal stations for munitions, a single aircraft can carry a total of three EWPs, housing up to 12 AMRAAMs and 2 Sidewinders. The next-generation cockpit features a 19 x 11-inch touch-sensitive