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An ICBM First: The first revamped Peacekeeper warhead (MK21 re-entry vehicle) has been deployed on a Minuteman III ICBM, according to a Northrop Grumman release. (We now find that the first SERV deployment took place in October 2006. The Air Force says it has since fielded several—actual number withheld—more.) The feat required a “major revision” on the Minuteman software, under the Safety Enhanced  Re-entry Vehicle program. USAF expects to have its entire 500-strong MMIII fleet upgraded by 2012, extending the service life of the ICBMs to 2020.