From veteran.com :

In most cases, no matter what the specifics of the regulations for each branch of military service have to say on the subject of uniform wear by retirees and veterans, the end result is the same. You are expected to wear the uniform appropriately, on the right occasions, and you are expected to NOT promote commercial or political causes while wearing the uniform of the Army, Navy, Air Force, Marine Corps, or Coast Guard

Pretty sure even if he was a veteran, wearing his uniform in this situation is strictly prohibited

I learned vim (technically vi) because it was the only editor available on these tiny liveusbs I would use for work. It was literally my only option. Once I got used to the motions, using any text editor without vim motions felt unusable to me.