support operations there. The final Block 10 aircraft was delivered on 26 June 2006. To increase the aircraft's capabilities, the airframe was redesigned, with the nose section and wings being stretched. The modified aircraft, designated RQ-4B Block 20, can carry up to 3,000 lb (1,360 kg) of internal payload. These changes were introduced with the first Block 20 aircraft, the 17th Global Hawk produced, which was rolled out in a ceremony on 25 August 2006. First flight of the Block 20 from the USAF Plant 42 in Palmdale, California to Edwards Air Force Base took place on 1 March 2007. Developmental testing of Block 20 took place in 2008. United States Navy version The United States Navy took delivery of two of the Block 10 aircraft to evaluate their maritime surveillance capabilities, designated N-1 (BuNo 166509) and N-2 (BuNo 166510). The initial navalised example was tested at Edwards Air Force Base briefly, before moving to Naval Air Station Patuxent River in March 2006 for the Global Hawk Maritime Demonstration (GHMD) program, operated by Navy squadron VX-20. In July 2006, the GHMD aircraft flew in the Rim of the Pacific (RIMPAC exercise) for the first time. Although it was in the vicinity of Hawaii, the aircraft was operated from NBVC Point Mugu, requiring flights of approximately each way to the area. Four flights were performed, resulting in over 24 hours of persistent maritime surveillance coordinated with the aircraft carrier and amphibious warfare ship . For the GHMD program, the Global Hawk was tasked with maintaining maritime situational awareness, contact tracking, and imagery support of exercise operations. Images were transmitted to NAS Patuxent River for processing and then forwarded to the fleet off Hawaii. Northrop Grumman entered a RQ-4B variant in the US Navy's Broad Area Maritime Surveillance (BAMS) UAV competition. On 22 April 2008, it was announced that Northrop Grumman's RQ-4N had won and that the Navy had awarded a US$1.16 billion contract. In September 2010, the RQ-4N was officially designated the MQ-4C. The Navy MQ-4C differs from the Air Force RQ-4 mainly in its wing. While the Global Hawk remains at high altitude to conduct surveillance, the Triton climbs to to see a wide area and can drop to to get further identification of a target. The Triton's wings are specially designed to take the stresses of rapidly decreasing altitude. Though similar in appearance to the Global Hawk's wings, the