When my dad was sent to Korea in 1950 he said they walked a like that had people on both sides giving shots. He and the others were getting shots as they walked the line from both sides at the same time. Fortunately that was the only way he was shot.
I recall seeing photos of that back when shots terrified me. I thought, “The enemy is not overseas. It’s right here!
Glad your dad made it back. What branch?