Rangers are reconnaissance and assault specialists. We excel in sending small teams deep into enemy territory to scout out the enemy or conduct ambushes and prisoner snatches. Ranger units are also used to seize high-value, high risk targets like headquarters and airfields. Ranger Battalions are organized as a light infantry unit, and there are Rangers of all ranks.
Special Forces (a Green Beret is a hat) are optimized to train, organize, and work with local forces. SF are all at least Sergeants, and many are long-serving NCOs. They are trained to operate in foreign nations as near natives, with extensive language and cultural immersion. The role of an A-team is to work with the natives so they can fight their own war. The invasion of Afghanistan by the Northern Alliance in 2001 was accompanied by numerous SF soldiers who rode horses, wore beards, and called in air strikes to aid their allies.
SF can also perform the recon and ambush missions, but it is a waste of a precious resource.
