Sprint was a U.S. anti-ballistic missile interceptor designed for extremely short reaction windows after an incoming reentry vehicle entered the lower atmosphere. It formed the inner layer of the Safeguard/Nike-X defense architecture, complementing longer-range Spartan interceptors.
Sprint's defining feature was very high acceleration for terminal interception within seconds. The missile used command guidance and a nuclear warhead concept because hit-to-kill precision against fast reentry vehicles was not yet practical for the period.
Sprint's operational life was brief because U.S. ballistic missile defense policy and treaty limits changed rapidly in the 1970s. Its importance is historical and technical: it remains an example of the extreme engineering demands of nuclear-era terminal ABM defense.
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