It's not very common these days because because there's no draft. Everyone in the military is there because they voluntarily enlisted, so soldiers killing their COs because they don't want to be there isn't much of a problem for the military. The officer class would like to keep it that way, which is why they oppose the draft. It was an issue in Vietnam because there were people there against their will fighting a war they didn't agree with. It generally happened for one of two reasons: 1) The solider was out of fucks to give and turned on his CO or 2) to save himself from a high risk stunt Captain Dumbass was about to pull to make a name for himself.
How frequently does this even happen? The last incident of friendly fire I heard about was the murder of Pat Tillman.
It's not very common these days because because there's no draft. Everyone in the military is there because they voluntarily enlisted, so soldiers killing their COs because they don't want to be there isn't much of a problem for the military. The officer class would like to keep it that way, which is why they oppose the draft. It was an issue in Vietnam because there were people there against their will fighting a war they didn't agree with. It generally happened for one of two reasons: 1) The solider was out of fucks to give and turned on his CO or 2) to save himself from a high risk stunt Captain Dumbass was about to pull to make a name for himself.