845 Naval Air Squadron is a squadron of the Royal Navy's Fleet Air Arm. Part of the Commando Helicopter Force, it is a specialist amphibious unit operating the AgustaWestland Commando Merlin 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 RNAS Yeovilton in Somerset.