SFC Harry L. Ettmueller, USA, was the Chief Engineer at Hue, 1967-68. He was captured by the North Vietnamese during the TET ’68 offensive on February 5, 1968 and remained a POW until March 5, 1973.
I have not been able to find Harry’s obituary, which is what I would normally place here. In lieu of same, here are Bob Morecook’s and John Bagwell’s messages of February 14 & 15, 2020, notifying everyone of Harry’s passing. The are then followed by a number of other messages of condolence.

From Hanoi Hilton to Broadway Pier: An American POW’s Lessons in Survival (Henry James Bedinger)
Between November 1969, when he was shot down over Laos during a reconnaissance mission, and March 1973, when he was freed as part of Operation Homecoming, Navy Lt. j.g. Henry James Bedinger was a prisoner of war at Hỏa Lò Prison — the infamous Hanoi Hilton.