THERE ARE AT LEAST 35 MEGACITIES-or "dense urban areas" (DUAs), in doctrinal terms-in the world, most of them adjacent to littorals. Lagos, Nigeria; Mumbai, India; and Seoul, South Korea, to name just three, are among the many that also sit in active or potential conflict zones. The U.S. military almost certainly will have to fight in one or more of these 35 in the near future. The U.S. Army and Marine Corps, supported by the air power of the Navy and Air Force, are second to none at combat in open space, but they will need to learn how to fight in the city. And the first thing to learn is that, unlike existing "military operations on urban terrain" (MOUT) training sites, the city never stays still.
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