but there is a guy that I know that is pulling 6 figures straight out of college playing trumpet in Washington DC.
Not to be nitpicky, but if you start thinking about financial income more than artistic needs at your early stage I think you might hate being a professional musician.
Playing professionally is a balancing act between making ends meet and playing what you want. When both come together it's bliss.
If you were to join the military for stability rather than because it's something you want to do, you may find yourself unhappy. You may not.
But most players who choose a performance career in music do so as a vocation, not with a set income in mind. Again, after a few years of single figure income you may find yourself unhappy,
if six figures seems more attractive regardless of the music.