The "Spirit of Pennsylvania" B-2 with the 419th Flight Test Squadron, 412th Test Wing, flies over Air Force Operating Location Plant 42 in Palmdale, Calif. on July 17th (U.S. Air Force Photo)
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U.S. Air Force B-2 Spirit stealth bombers by Northrop Grumman [NOC] typically undergo a 470-day programmed depot maintenance (PDM) every nine years in Palmdale, Calif., to repair the bomber and restore its low-observable (LO) materials, but the Air Force Life Cycle…