Donald Trump 's comparing throwback pics against Barack Obama 's ... flaunting his put-together military style -- while seemingly roasting his predecessor for lighting up. POTUS posted a split-photo comparing the two in their younger days ... capturing him in his uniform from the New York Military Academy, which he attended in the early 1960s, and the former prez from early on at his time at Occidental College. Obama wears a wide-brimmed hat, a collared shirt, and puffs on a cigarette in the

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