Nike Zeus Development continued, producing Improved Nike Hercules and then Nike Zeus A and B. Zeus, with a new 400,000 lbf (1.78 MN) thrust solid-fuel booster, was first test launched during August 1959 and demonstrated a top speed of 8,000 mph (12,875 km/h) but had certain deficiencies and was renamed Spartan launched 1967. Production of the Zeus was deferred in 1961 and phased out during 1963 in favor of a specific ABM system initially designated Nike X but later renamed Sentinel. http://en.wikipedia.org/wiki/Nike_Zeus
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