The Royal Navy Observer School grew out of HM Naval Seaplane Training School at RNAS Lee-on-Solent as a result of a series of changes of identity and parent unit. From 1918 until 1939 the Royal Air Force was responsible for naval aviation, including training and provision of aircrew to the Royal Navy. With the return of naval aviation to the Royal Navy on 24 May 1939, the Observer School was established as 750 Naval Air Squadron of the Fleet Air Arm. During World War II the squadron moved to Trinidad to continue training aircrew. It was temporarily disbanded in October 1945. The squadron reformed in 1952 and is currently based at RNAS Culdrose, where it trains approximately 30 Royal Navy observers every year.

The Fleet Air Arm (FAA) is the naval aviation component of the United Kingdom's Royal Navy (RN). The FAA is one of five RN fighting arms. As of 2023 it is a predominantly "rotary" force, with helicopters undertaking roles once performed by biplanes such as the Fairey Swordfish. It operates the F-35 Lightning II for maritime strike and the AW159 Wildcat and AW101 Merlin for commando and anti-submarine warfare.