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.
1st United States Sharpshooters
The most notable aspect of the Berdan Sharpshooter uniform is the green color, rather than the standard Union blue. They were one of only a few regiments that went outside the typical Potomac Army's uniform. The green uniform gave the sharpshooters the clear advantage of camouflage, but also sometimes was a disadvantage because they were easy to distinguish against the rest of the Union soldiers for Confederate marksmen to spot and target. Sharpshooters were high-priority kills amongst the Confederate army, because they had such high skills and good salvageable equipment. Sharpshooters used more guerrilla warfare battle tactics than the rest of the Union infantry. Along with the green uniform, a soldier was to have no brass on any of their buttons. Their shoes were standard Union issue, but their pants were made of green wool just like the frock coats, with a pair of gaiters. Furthermore, Sharpshooter knapsacks were a Prussian-style fur sack fitted over a wooden frame, as opposed to the usual tarred canvas. However, as the war went on the men were not reissued this clothing and many of the men received standard federal clothing making them harder for rebel troops to notice their elite capabilities. By the Gettysburg campaign most of the men were wearing modified blue uniforms.