(The Dambusters) Squadron officially reformed on 18 April 2018 as the first operational RAF Lightning squadron. The first four aircraft arrived at RAF Marham from the United States in June 2018, with a further five arriving in August 2018. The Lightning was declared combat ready in January 2019. The second UK based F-35B squadron to be formed was No. 207 Squadron on 1 August 2019 as the OCU for both RAF and Royal Navy pilots. Intelligence, surveillance, target acquisition, and reconnaissance (ISTAR) Six Hawker Beechcraft Shadow R1s (with two more to be converted) are operated by No. 14 Squadron from RAF Waddington, these aircraft are King Air 350CERs that have been specially converted for the ISTAR role. Four Shadow R1s were originally ordered in 2007 due to an Urgent Operational Requirement, and began the conversion process to the ISTAR role in 2009. ZZ416 was the first Shadow R1 to be delivered in May 2009 to No. V (AC) Squadron. A further Shadow was procured and delivered in December 2011. The Shadow fleet was transferred over to the newly reformed No. 14 Squadron in October 2011. Following the 2015 SDSR, three more Shadows were ordered and the fleet was given an OSD of 2030. Ten General Atomics MQ-9A Reaper unmanned aerial vehicles have been purchased to support operations in Iraq and Afghanistan. They are operated by No. 39 Squadron based at Creech Air Force Base and No. XIII Squadron at RAF Waddington. Three Boeing RC-135W Rivet Joints (also known in RAF service as Airseeker) replaced the Hawker Siddeley Nimrod R1 fleet in the signals intelligence role under the Airseeker Programme and are flown by No. 51 Squadron. The Nimrod fleet was retired in 2011, the RAF co-manned aircraft of the US Air Force until the three RC-135s entered service between 2014 and 2017. The aircraft were Boeing KC-135R Stratotanker tankers converted to RC-135W standard in the most complex combined Foreign Military Sales case and co-operative support arrangement that the UK had undertaken with the United States Air Force since the Second World War. The Rivet Joint received its first operational deployment in August 2014, when it was deployed to the Middle East to fly missions over Iraq and Syria as part of Operation Shader. The RC-135W's OSD is 2035. Based at RAF Waddington, No. 54 Squadron and No. 56 Squadron act as the OCU and OEU for the ISTAR fleet respectively.