If you are looking at joining the Navy, you should. I was in the Navy and serving your country like that is one fo the most honorable things you can do for mankind. Nothing against those that don't serve, it's not for everyone. But if you do it and love it, it makes for a wonderful career.
I have a goat, and have looked at different ways to change it up while keeping the facial hair. Not big into the mustache thing on it's own, but I have had facial hair as long as I can remember, minus my Navy time.
Good luck man!!
"May God grant you fair winds and following seas" Admiral Rickover