Here are some facts.
Lieutenant Will Williams was stationed at a Special Forces camp A-414 near the village of Thanh Tri, in a border-area west of Saigon nicknamed "the finger" because it formed an indentation into Cambodia. The dozen or so American Special Forces soldiers assigned to this camp became known as the Defenders of the Finger.
This plaque, made while Will Williams was in Vietnam with a carved hand that he bought in Thailand, represents Vietnamese territory in yellow and Cambodian territory in red, and shows the anomaly in the border known as "the finger," where the base was located.
Because of its proximity to Cambodia on three sides, the base was frequently shelled by the Viet Cong, who used Cambodia as a refuge. Whenever that happened, somebody would have to run to the top of a steel observation tower called "Silver Star Tower," (because whoever would climb that tower while the base was under attack deserved a medal) to try to determine whence the fire originated.
Terry McIntosh's documentary Double Agent Down narrates a particularly harrowing incident that Will Williams experienced in Vietnam while leading a CIDG (Civilian Irregular Defense Group).
Ten days after this battle, Lieutenant Will Williams was promoted to Captain.