The Mark VI is a class of patrol boat in service with the United States Navy, designed to patrol riverine and littoral waters. The first two Mark VI boats were delivered to Coastal Riverine Group TWO in September 2015. Two boats were forward deployed to Bahrain in April 2016, with Coastal Riverine Squadron TWO being the first to operate the craft in the Persian Gulf while assigned under Task Force 56. The Mark VI replaced the less capable Riverine Command Boats previously assigned to Task Force 56.