http://www.g2mil.com/lost_vietnam.htm
One theme presented by supporters of the American empire is the U.S. military is invincible and can never lose unless stabbed in the back by impatient politicians. They claim the U.S. military never lost a battle during the entire Vietnam war. On August 30, 2011, President Barack Obama proclaimed to a gathering of veterans: "But let it be remembered that you won every major battle of that war. Every single one." This myth had been disputed by America's most decorated officer of that war, Col. David Hackworth, in his book "About Face." The U.S. military had every advantage, yet mistakes were made and battles lost. Internet research turns up these 70 lost battles of the Vietnam war:
http://www.g2mil.com/lost_vietnam.htm