Northrop Grumman to Upgrade USAF B-2 Bombers

The Air Force's newest and most advanced bomber is also its least mission-ready. The B-2 Spirit's 20-bomber fleet had a 51.3 percent mission capable rate in fiscal 2012, below the B-1B Lancer's 56.8 percent and the aging B-52's 78.3 percent, according to a report released recently by the service.

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