Different jobs attract different personalities. The Mike Tysons of the world do not go into ballet, nor do the Mother Teresas become tank commanders. The career military attracts people who run from the merely abnormal to the frankly weird. For example, they place extreme value on ritual and ceremony, on ribbons and medals and colored things more appropriate to a Christmas tree than to a human being. They are authoritarian by nature, comfortable in a rigid, hierarchical, and conformist society that most of us would find equally unbearable and absurd. Suppose your boss told everyone in the office that they had to wear exactly the same clothes and stand at attention in the morning to that he could determine whether they had dressed themselves correctly. Militaries start with odd material.
Then they inculcate in themselves an exaggerated sense of their own powers, a sort of Terminator complex. This is done calculatedly in basic training when men are in impressionable late or, in the case of officers, extended adolescence. They absorb the notion of invincibility and it persists into adulthood. Read More Here