The Peter Principle states that "in a hierarchy every employee tends to rise to his level of incompetence", meaning that employees tend to be promoted until they reach a position in which they cannot work competently. It was formulated by Dr. Laurence J. Peter and Raymond Hull in their 1969 book The Peter Principle, a humorous treatise, which also introduced the "salutary science of hierarchiology." -- Wikipedia.
Lt. J.G. Timothy Dorsey Intentionally Shot Down Friendly RF-4C in 1987. You know, I once explained to Grandpa Vanderboegh about the Peter Principle. He snorted and said, "What you mean is, shit floats to the top of the pond." Which, when I thought about it for a moment, I replied, "Right."