this thing has a post-boost vehicle - a missile bus. after the boost phase, the missile bus - it has its own propulsion system - can make fairly substantial maneuvers, relative to - say - an imaginary test mass that continues on the same trajectory the missile attained at burnout. the pbv can move several kilometers relative to this point - it's a matter of relative motion - so that the reentry vehicles end up spaced out. this is why there is a delay between the first and last rvs.
United States