Pretty much all of us have heard of the phrase, "Danger Close". But what does it mean and how does it effect wargaming?
First off, "Danger Close" is a radio phrase to warn friendly troops that the caller of the artillery or air strike is ordering a strike close to other friendly troops, so that they take extra caution or protection for the incoming strike. There is no restrictions to have incoming strikes come in closer, just a warning.
So what makes something be "Danger Close"? According to the US military, any time that there is a 1% or greater chance of hitting friendly troops is considered to be "Danger Close", or in official terms, "Minimum Safe Distances (MSD)" for the US Army and "Risk Estimate Distance (RED)" for the US Air Force.
Below is the generic "Danger Close" distance for various weapons. While I was only interested in the Vietnam era weapons for Charlie Don't Surf, I thought some of you might be interested in seeing the distances. When you think that in Charlie Don't Surf, 1'=100m, you start to realize that the "Danger Close" for a 105mm strike is 4' on the board! Also, the numbers can change with the distance from the cannons to the impact zone and I provided some of the alternative distances with the range.
I hope you find this interesting!