Free World Military Forces (FWMF) was a military force composed of a collective group of six nations who sent troops to fight in the Vietnam War under the FWMF banner, assisting the United States and South Vietnam.
The Free World Military Forces supported American and South Vietnamese forces against communist forces, such as the Vietcong. The number of troops sent varied greatly, with nearly 300,000 from South Korea, and only 10 from Spain. Many of these countries fought under their own banners in the Vietnam War, but were part of the FWMF organization, or had troops fighting under both their own banner in addition to sending FWMF forces.
Over two thirds of the Free World Military Forces were from South Korea.