(Correction: The story was corrected on May 24. The original story incorrectly stated that the Space-based Kill Assessment experiment would explore the feasibility of integrating a space-based interceptor into the Ballistic Missile Defense System. The SKA is a sensor designed to determine whether an interceptor hits an intended target and is not an interceptor itself.) The Defense Department is seeking funding for two significant missile defense initiatives in fiscal year 2018: a project to develop a defense against hypersonic...