The F-35B has not yet entered frontline service with the UK Armed Forces. A single RAF test pilot is at Naval Air Station Patuxant River as part of the multi-national integrated test force. A joint team of RAF and Royal Navy pilots is at Edwards Air Force Base operating as part of the multi-national team undertaking operational test and evaluation. While clearance for operational use of night vision (enhancement) continues in the multi-national test team, UK pilots have completed no night landings using the system. However, UK pilots have completed 20 conventional visual night landings.