"Donald’s father, Fred Trump, already alarmed by his behavior in school and in church, promptly shipped him off to NYMA to be straightened out. The academy, where Trump arrived in 1959, was hardly a common destination for the children of New York City’s elite. Trump had been raised with a chef and chauffeur, and was shocked by this strict, abrasive, and intensely physical environment. Scuffles and fights were common. Trump allegedly got into an argument with his roommate Ted Levine that got so heated he tried to throw Levine out of a second-story window. But by all accounts, Trump responded well to the rigidity of a military academy; it was the ideal educational incubator for someone with an unquenchable thirst for competition and a love of physical dominance...."
From "Was Donald Trump Good at Baseball?/The president has long claimed he could have gone pro. We looked into it" (Slate).