I’m something of a science fiction fan, so the subject of time travel comes up from time to time. Movies, books, and short stories usually talk about big things like going to Germany and killing Hitler as a baby, but since the butterfly effect would be too strong there, I decided to address the smaller things, and just send myself a message with some tips on how to make my military career and life in general just a little better. Here’s the letter, I’d wish my pre-military self had received in 1991.