One of the oldest battlefields in the history of warfare is back. The U.S. Army recently took part in an underground training exercise, called Exercise Warrior Shield, in March earlier this year.
Soldiers practiced subterranean warfare tactics at training facilities in South Korea, including breaching entrances to underground buildings. This type of subsurface exercise is increasingly being implemented by armies around the world. Underground complexes, first warred over by our primitive ancestors, are now seen as critical terrain in places like Korea, the Middle East, and the world’s major cities.
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Source: Popular Mechanics