The Royal Air Force, or RAF, was Old Britain's primary air defense force in the 20th and 21st centuries and the first air force to be established in pre-warp Human history. Among the feats the RAF achieved was securing British airspace against German air supremacy, preventing a ground invasion during World War II. The most notable battle in this campaign was the Battle of Britain.
In the Hirogen World War II holodeck simulation set in 1944, Commander Chakotay (as Captain Miller), suggested calling in the RAF to bomb a German military installation, which was in fact a breach in the holodeck to the rest of the USS Voyager. (VOY: "The Killing Game, Part II")