The F-22 Raptor is among the planet's most advanced combat aircraft, but to ensure it stays ahead of new Russian and Chinese fifth-generation fighters, the service has had to rip up the rulebook—and get Lockheed Martin to rip up its own, too. Two years ago, faced with mounting delays in F-22 modernization efforts that threatened the fighter's dominance over its competitors, the Air Force decided to reform the way it rolls out updates to the Raptor. Instead of a conventional approach, in which requirements are documented in detail and the update is not delivered until every element is complete, USAF wanted to introduce new capabilities on a rolling basis using an approach known as "agile" development.
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