845 Naval Air Squadron is a squadron of the Royal Navy Fleet Air Arm. Part of the Commando Helicopter Force, it is a specialist amphibious unit operating the Westland Sea King HC4 helicopter and provides troop transport and load lifting support to 3 Commando Brigade Royal Marines. In 2012 the squadron celebrated 50 years since it was awarded "commando" status. The squadron is based at HMS Heron, RNAS Yeovilton in Somerset.