On the evening of 28 January, just west of Hieu Duc, a Marine squad from Company C, 1st Battalion, 7th Marines ambushed a three-man Viet Cong reconnaissance patrol. The Marines killed two of the enemy and wounded the third. The Marines evacuated the survivor to the Naval Support Activity hospital where he died of his wounds. Before his death, however, the Vietnamese identified himself as Major Nguyen Van Lam, the commanding officer of the R-20 Doc Lap Battalion. From the recovery of Lam's notebook and a detailed sketch map of Hill 10, the location of the 1st Battalion, 7th Marines' command post.......