50 years ago, on October 17, 1967, U.S. troops were ambushed in the Battle of Ong Thanh. Lieutenant Colonel Terry Allen, commander of the Black Lions special unit, led his men into the jungle of Vietnam, looking for engagement with the Viet Cong. Of the 142 Americans who went out that day, 64 died, including Allen. Our documentary “Two Days in October” is now streaming free: http://to.pbs.org/2xJZaRU | American Experience | PBS