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From the experience of state militias during the American Revolution, to the Spanish-American War; from the legendary Merrill’s Marauders, the highly skilled and toughened American jungle fighters who served in the Burma-India theater in World War II, to the members of the OSS (the Office of Strategic Services), who on specific assignments fought alongside native guerrilla forces, the Americans had a long and honorable guerrilla-fighting tradition. Where and why this was forgotten in Vietnam remains a mystery.
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Tom Mangold (The Tunnels of Cu Chi: A Harrowing Account of America's Tunnel Rats in the Underground Battlefields of Vietnam)