 However, the UK Government's announcement of the procurement of five Boeing E-7 Wedgetails in March 2019 led to the withdrawal of two Sentry AEW1s in preparation for the future transition to the new type, bringing the fleet down to four aircraft.In February 2020, it was announced that another E-3D had been retired in January, with the OSD (out of service date) for the Sentry being brought forward to December 2022 – before the E-7 Wedgetail will enter service.The Raytheon Sentinel R1 (formally known as ASTOR – Airborne STand-Off Radar) provides a ground radar-surveillance platform based on the Bombardier Global Express long range business jet, and is flown by No.