He started college in 1960 or '61, (He started at Yale but switched to and graduated from U.of Wyoming, graduating in '65 and got an MA in '66) before most Americans had even heard of Vietnam. Was he going to college to get out ot the draft, or just because he wanted to go to college? By the time he got out, he was 24 years old, and married with a kid on the way, he got married in '64. Did Lynn get pregant just so he wouldn't be drafted? I don't know the answer to the second question, but the answer to the first is most likely that he just went to college because he wanted to better himself, or party hearty or whatever, but not to dodge the draft. His "manuevering" was most likely just making choices he would have made anyway, draft or no draft.
Why can't your assumption include he also might not have wanted to be drafted.