they randomly test them yearly, sometimes multiple time per year, and they have a 95%+ success rate in testing. and the mmiii is constant;y upgrade and updated. it's literally not even the same missile as the original mmiii anymore. even the rv is upgraded. the 2007 marked the date of the final installation of the ns-50 missile guidance system.   eguidancesystem.html > propulsion replacement program upgraded all three rocket stages   /mmiii-010423.htm > launch control center upgrade   ommunications/article/14196780/upgr ade-minuteman-iii-nuclear-missiles guidance upgrades:   f-analog/article/16714802/boeing-to -upgrade-missile-guidance-systems-o n-minuteman-iii-landbased-nuclear-r ockets   eguidancesystem.html
United States