Sunday, October 23, 1983 23 October 1983 At 0622 an explosive-laden truck slammed into the BLT headquarters building in Beirut, Lebanon, where more than 300 men were billeted. The massive explosion collapsed the building in seconds, and took the lives of 241 Americans--including 220 Marines. This was the highest loss of life in a single day for Marines since D-Day on Iwo Jima in 1945. Print