Albert Cook (Charles Robinson) refers to Khe Sahn, which was a battle during the Tet Offensive in 1968 (in the Vietnam War) where the United States Marines defending the base at Khe Sahn held off two divisions (a force four times their size) of communist North Vietnamese army soldiers.
This is the last Adam-12 episode to have a log number in the episode title. Beginning with season 4, episode titles no longer have a log number.