Which event contributed to the removal of the Army rank system in favor of specific Air Force ranks?

The event that significantly contributed to the removal of the Army rank system in favor of specific Air Force ranks was the Air Force Rank Change of 1952. This change was pivotal because it established a unique rank structure that differentiated the Air Force from the Army, reflecting its distinct mission and responsibilities within the military framework.

Prior to this, the Air Force utilized a ranking system borrowed from the Army, which did not adequately address the specific roles and functions of Air Force personnel. The 1952 change allowed for tailored ranks that better aligned with the organizational needs and identity of the Air Force, thereby reinforcing its status as an independent service branch.

The other options, while relevant to military history, do not directly pertain to the restructuring of rank systems within the Air Force. The Battle of Britain was primarily a significant event in World War II focused on air warfare tactics and strategy, while the Korean War Reorganization dealt more with operational deployment rather than rank structure. The Unified Command Plan is related to the strategic organization of U.S. military commands but does not specifically involve the Air Force's ranking system. Thus, the 1952 reforms were crucial for establishing a distinct identity and functional hierarchy within the Air Force.