Established by CNO on 01 February 1964 as Boat Support Unit ONE, a component command of Naval Operations Support Groups, Pacific. Its mission was to administer the newly reinstated PTF (Patrol Torpedo Fast) Boat program and to operate high speed craft in support of Naval Special Warfare Operations, this primarily in conjunction with UDT and SEAL units. The missions were soon expanded to include all aspects of riverine and restricted water warfare. The PTF program grew rapidly, beginning with four "Nasty" class PTF's in the fall of 1964. Crews attended schools in the San Diego area, then deployed to Subic Bay, Philippines, to put their boats in service and prepare for operational commitments, As a result of events in the Tonkin Gulf, there had been a great demand for simulated PTF type attacks for training, and Boat Support Unit ONE was tasked with providing such services. In September 1965, Boat Support Unit ONE implemented the original training for PCF (Swift) crews in underway boat operation for duty as part of the MARKET TIME patrol in Vietnam, using eight Swift Boats. On 01 July 1971, Boat Support Unit One was re-designated Coastal River Squadron ONE and its mission broadened to encompass coastal/riverine patrol and warfare.