One proposed approach would build the Zumwalt class with whichever new technologies were ready at launch. Positions intended for unfinished systems would initially receive standardized equipment similar to equipment already in service. The later technology could replace those fittings when it became ready. This is a proposed procurement choice, rather than an account of the ships' actual construction.
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An alternative proposal for fitting Zumwalt's new technology
A proposed Zumwalt procurement approach would fit working equipment first and replace it with new systems as they became ready.