2015 budget funding also to continue efforts aimed at developing a kill vehicle that could be used on a Standard-Missile-3 ...

Pentagon to upgrade, improve U.S. missile defense system

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"...The fiscal 2015 budget also continues to fund that work, Syring said, noting that the effort was aimed at developing a kill vehicle that could be used on a ground-based interceptor, a Standard-Missile-3 or some future system...."
Reference: www.reuters.com .