There is this obsession with "so called" Cooper suspects to be extraordinary people,, a bad ass special ops,, a metallurgist who worked on the Manhattan project, an assassin, CIA spy or mercenary etc...... Cooper was a forgettable loner, above average intelligence but a bitter chronic underachiever whose grudge was to accomplish something substantial in life... Something nobody else had done based on his ability after lifelong rejection from a corrupt system that rewards undeserving people....
Cooper was not unique or special or remarkable in life...