4th Air Force, Hamilton AFB, California

• Origins in World War II: The 4th Air Force was established in 1940 as the Southwest Air District, later redesignated and tasked with defending the western United States against possible attack during World War II. • Air Defense of the Pacific Coast: Stationed at Hamilton Army Airfield in California, the unit was a key part of the air defense network protecting the U.S. Pacific coastline from Japanese threats during WWII. • Training Hub: During WWII, the 4th Air Force was responsible for training thousands of pilots, aircrews, and support personnel for combat in both the Pacific and European theaters. • Fighter and Bomber Operations: The unit oversaw fighter and bomber operations, including P-38 Lightnings, P-51 Mustangs, and B-25 Mitchells, providing vital defense and training missions. • Cold War Role: After WWII, 4th Air Force remained at Hamilton AFB, transitioning into a key component of the Air Defense Command during the early years of the Cold War, with jet interceptors like the F-86 Sabre. • Hamilton AFB’s Strategic Location: The base’s location near San Francisco Bay made it a critical west coast defense site, especially during periods of heightened tension like the Korean War and Cuban Missile Crisis. • Innovations in Air Defense: In the 1950s, Hamilton AFB and the 4th Air Force played a role in experimenting with and implementing new radar and missile defense technologies, such as the Nike missile system. • Reserve and Airlift Mission: By the 1960s and 1970s, 4th Air Force took on a new role as part of the Air Force Reserve, focusing on airlift operations and supporting global mobility missions. • Famous Personnel: Several distinguished aviators and commanders served with the 4th Air Force at Hamilton AFB, including General Carl Spaatz, who was a leading figure in U.S. air power development. • Legacy and Closure: Hamilton AFB was closed in 1974, but the 4th Air Force continues its legacy today as a vital part of the Air Force Reserve Command, headquartered at March Air Reserve Base in California.