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https://jimmiekepler.com/2006/01/01/steel-my-soldiers-hearts-the-hopeless-to-hardcore-transformation-of-the-u-s-army-4th-battalion-39th-infantry-vietnam-by-david-hackworth/
Steel My Soldiers' Hearts: The Hopeless to Hardcore Transformation of the U.S. Army, 4th Battalion, 39th Infantry, Vietnam by David Hackworth