A gap in the UK's airborne surveillance capability is expected to open in 2021 when the Royal Air Force (RAF) retires its remaining four operational Sentinel Rl Airborne Stand-Off Radar (ASTOR) aircraft. The RAF's directorforfixed-wing manned aerial surveillance platforms, Group Captain Shaun Gee, revealed in the service's Annual Review 2020 journal published at the beginning of February, "Sentinel is currently scheduled to leave service in 2021, although no alternative source of its unique capability has been identified in that timeframe."
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