Contemporary Russian countour flying. In 1971, I was riding north on a winding road through the forests in the hills near Xuân Lộc, South Viet Nam, when suddenly a US Army LOH (pronounced Loach: Light Observation Helicopter) surprised us by appearing close overhead. He had flown up from behind us, about four meters off the road, and we had no idea he was coming. The pilot kept his LOH perfectly above the center of the road, the same height above the road up and down as it went through the hills, with forest hugging either side of the road. We were very impressed. Everybody knew all helicopter pilots were nuts, but that guy was good!!
This is what a LOH looks like.
You could knock one out of the air with a flyswatter.