846 Naval Air Squadron is a squadron of the Royal Navy's Fleet Air Arm. Between December 1979 and the summer of 2013, 846 Naval Air Squadron operated the Westland Sea King HC4 helicopter to provide troop transport and load lifting support to 3 Commando Brigade Royal Marines. Based at RNAS Yeovilton in Somerset, 846 NAS stood down in the summer of 2013 and its personnel, buildings and equipment were amalgamated into 845 Naval Air Squadron.