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The United States Air Force, like the Coast Guard, Army, Marines, and Navy is one of the five divisions of the Armed Forces of the United States of America. The organization was founded September 18, 1947.
In 2013, prior to the Battle of Metropolis, the United States Air Force lead by Col. Nathan Hardy, rushed to Smallville, Kansas as the Sword of Rao clashed with Kal-El in a Kryptonian conflict that devastated the small town.
2 years later, when Doomsday emerged from the Fortress of Solitude near Heroes Park in Metropolis, the USAF arrived to help battle the monster while Superman was incapacitated. Unfortunately, Doomsday proved too much for the military force and the USAF was overwhelmed and suffered many casualties as Doomsday emitted an enormous burst to heal himself from damage.
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