http://www.statisticbrain.com/vietnam-war-statistics/ 86% of the U.S. casualties were Caucasian 86% of the U.S. casualties were Caucasian 58,000 Americans were killed 11,465 were under the age of 20 58,000 Americans were killed STATISTICBRAIN.COM statisticbrain.com statisticbrain.com Number served in Vietnam.