This issue has variants.
Possible Janson inks per Nick Caputo, August 2016. Previous indexer credited Vince Colletta. In a thread on Tom Palmer's Facebook, Palmer, denied inking this cover, as did Don Perlin and Bob Wiacek. Other possible inkers suggested included Frank Giacoia, Mike Esposito, Dave Cockrum, or a group effort. (Info submitted by Billyd75 via the GCD Error Tracker.)
Flashback story, takes place in Vietnam, probably in TALES OF SUSPENSE #50