The Story of 1st Lt. Cochrane Killed by Viet Cong Sniper
On 24 October 1966, 1st Lt. John F. Cochrane of the 409th Radio Research Detachment (RRD), 303d Radio Research Battalion, was killed by a Viet Cong sniper while looking for a suitable site to set up a PRD-1 direction finder. He was one of two battlefield losses within the detachment.
Source: sofrep.com