What was the soldier to enemy kill ratio in Vietnam?

For the air war; it was 2 US Jets shot down per 1 North Vietnamese MIG shot down. This figure changed after the US Navy's TOP GUN (aerial combat) school opened in 1969. For the ground war (involving US Forces), the US almost always considered a kill ratio of 10 to 1 in the US's favor. Reasons: 1. We had the artillery. 2. We had the air power. 3. We had the firepower on the ground. 4. The enemy dragged their KIA's away and/or buried them; therefore we knew there were more bodies than we found. Consequently, the score was higher. If we found 50 bodies; then we estimated they buried the other 50; body count for the battle was therefore 100. 5. The US High Command demanded a high body count.