He was classified 1-A in November 1966, and again in July 1968, ostensibly after he recently had graduated from college and in between his 2-A college deferments. He then had a second Armed Forces physical in September 1968, and the the following month in October 1968 was classified 1-Y, a medical deferment. Finally, he was reclassified from 1-Y to 4-F and disqualified for military service in February 1972.
I voluntarily entered the Armed Forces as a 17 y/o in 1972, near the end of Vietnam and when the draft was still in effect. Many young men were then trying to find ways to avoid the draft. Trump took legitimate advantage of college deferments, and then went from 1-A after graduation to 1-Y just three months later. At the medical exam in September 1968, Trump & his campaign claim he was diagnosed with bone spurs in his feet/heels, although medical records from that time have been destroyed. Trump said “one of his feet,” but couldn't remember which one. The campaign said bone spurs in both heels. His draft card lists “birthmarks” on both his heels — could that have been misconstrued as “bone spurs?”
At this point, I'll give Trump the benefit of the doubt, unless someone has any other information. Add to that, he received a high number in the 1969 draft lottery, 356 out of 366, and very likely would never have been drafted anyway.
Although, like me and many others, he could have volunteered. After all, he was a strapping 6'2”, weighed 180, played football & basketball at the New York Military Academy private boarding school, and was a decorated cadet. The jury will remain out in perpetuity; it's up to each to decide whether or not he purposefully avoided military service.