“If one man and his tiny team could claim more KIAs [killed in action] than an entire battalion without raising red flags among superiors; if a brigade commander could up the body count by picking off civilians from his helicopter with impunity; if a top general could institutionalize atrocities through the profligate use of heavy firepower in areas packed with civilians -- then what could be expected down the line, especially among heavily armed young infantrymen operating in the field for weeks, angry, tired, and scared, often unable to locate the enemy and yet relentlessly pressed