Answer:
A Swift Boat was a US Navy riverine boat in the Vietnam War; about 50 feet in length, constructed of aluminum, had two diesel engines, manned by 5 crewmen and commanded by 1 officer (usually a LTjg), had a twin .50 up front, and an over and under .50/81mm mortar aft. It's official USN title was, "PCF-Patrol Craft Fast'. Approximately 100 were sent to Vietnam; about 10 were totally destroyed during combat operations. All ended up in the hands of the North Viet Navy when North Vietnam defeated South Vietnam in 1975.
Never heard of a "malay" boat.