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“Each is highly scripted to maximize success,” Tierney wrote. “The timing and other details are provided in advance, information that no real enemy would provide. The weather and time of day are just right for an intercept. An adversary would use complex countermeasures, such as decoys, alongside the real missile to try to fool the defense system, but only simplistic versions of this trick have been included. Under realistic testing conditions, the program’s success rate would almost certainly be lower.”