In 21 years of military flying in both transport/patrol and tactical aircraft, I knew a few bad apples, but only a very few. One or two out of a hundred didn't meet my expectations but the rest were capable and reliable. During the mid-1960s when the Vietnam war was in full swing, A number of people who previously would not have graduated from U.S. Navy flight training were given their wings. They were a detriment to safety and to mission accomplishment. They didn't last long in fleet squadrons.