Green beret
The 10th Special Forces Group (Airborne) had many OSS World War II veterans in their ranks when it was formed in 1952. They began to unofficially wear a berets of varying colour while training. The color green became favored because it was reminiscent of the World War II British Commando-type beret. The 10th Special Forces Group (Airborne) deployed to Bad Tolz, Germany in September 1953. The remaining cadre at Fort Bragg formed the 77th Special Forces Group. Members of the 77th SFG began searching through their collections of berets and settled on the Rifle Green colour of the British Rifle Regiments (as opposed to the Lovat Green of the Commandos) from Captain Mike de la Pena's collection. Captain Frank Dallas had the new beret designed and produced in small numbers for the members of the Special Forces.
William P. Yarborough
It was during his tenure as Commander of the Special Warfare Center that in 1961, he arranged for President Kennedy to visit Fort Bragg, the results were twofold - acquiring the funding to further develop the Special Forces into a strategic unit within the US Army and the more visible sign - the authorization of the Green Beret for wear as the official headgear of Special Forces. Yarborough's design for the original parachutists uniform was incorporated into the 1963 Army tropical uniform that was later worn by all Army units in the Vietnam War.