Ruling him in or out

We’re back to the good same old, same old question about my biological father. I have found one I’m hoping is him, but with more information also comes more questions. Is it possible to be enlisted in the Navy from 1945-1946 (Wounded in action) and then re-enlist as something else? The he would pop up as something else as well then?

And since my mother met “her” Robert in 1961 in Berlin, something is not right with this guy. Then there is another fellow, who also fit the describtion as far as name and birthday goes. So now I’ve written to my helper, and asked again what he think we should do. Like I said recently. I’m about to give up on the whole thing.