Cairns AAF (Fort Rucker) Air Field — Fort Rucker/Ozark, United States

OZR refers to Cairns Army Airfield, part of Fort Rucker (now Fort Novosel) near Ozark, Alabama, and serves as the primary aviation training airfield for the United States Army. Fort Rucker is widely known as the Army's helicopter training center, and Cairns AAF handles an enormous volume of rotary-wing training flights for pilots learning to fly aircraft like the Black Hawk and Apache. The airfield is not open to civilian commercial traffic; it exists strictly to support military flight instruction and testing. OZR sees some of the highest air traffic volumes among Army installations due to the sheer number of daily training sorties. The surrounding area of Ozark, Alabama, has grown economically alongside the base's long-standing presence.