As U.S. troops fanned out across South Vietnam, American forces found themselves grappling with a unique type of fortification: underground tunnels. These subterranean structures, many extending deep into the earth, allowed Communist troops to shelter, to evade and then to re-emerge and attack areas thought to be secure. Encapsulating the lessons learned from years of anti-tunnel operations, this 1969 informational film was part of the U.S. Army's...
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