Which heavily marketed military product of the 1980s cost the US over $1.5 billion to develop but was canceled before deployment due to critical design flaws and cost overruns?

Throughout military history, numerous weapons, vehicles, and equipment have been developed with great promise but ultimately failed in the marketplace or in practical application. These retail and procurement failures often cost millions (sometimes billions) in development, yet never saw widespread deployment. Test your knowledge about some of the most notable military retail failures that were heavily advertised but ultimately abandoned.

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