South Vietnam, ca. 1967. A member of the South Vietnamese Popular Force (RF/PF) carries a crate of ammunition. These local militia fighters defended South Vietnamese villages against attacks by the Viet Cong. The Popular Force was one of two broad groups of militia, the other being the Regional Forces (địa phương quân). The American forces referred to both groups collectively as "Ruff-Puffs" referring to the abbreviation RF/PF.