The missile shield will be upgraded by multiple kill vehicles being carried up by as a single payload in a rocket. There are two competing tenders: Lockheed Martin and Raytheon. Lockheed guides the mini rockets from a central command unit, Raytheon’s system has each of the warheads acting as a seeker / controller in theory, but one of them becomes a master after launch and transmits the targetting plan to the other vehicles.

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