A Battle Buddy, for those of you who are not familiar, is a member of your unit who is there to cover your six. He's there to ensure you're doing the right things, training as hard as you can, and covering your blind spots so you don't do anything dumb – like get yourself killed.
It's a concept we used on the battle field. It's a concept used on the football field when you consider the blindside tackle whose job is to protect the quarterback at all costs. It's a concept that is used in every facet of life.