Patrol Craft Fast (PCF) - Swift Boats

Patrol Craft Fast (PCF), also known as Swift Boats, were all-aluminum, 50-foot (15 m) long, shallow-draft vessels operated by the United States Navy.  Its initial duties included patrolling the coastal areas of South Vietnam.  Its later duties included working in the interior waterways as part of the brown-water navy to prevent Vietcong movement of arms and munitions, transport Vietnamese forces and insert SEAL teams for counterinsurgency (COIN) operations during the Vietnam War.