My idea is to get a jersey that is part Navy, part Marine Corps and Part Air Force. Any idea where or how to get that?
What you are looking for sounds like a custom job, which cannot be found in shops. For such a jersey, you would have to talk to a T-shirt printing company and have them do a custom job for you. Take note that custom jobs are typically expensive.
Try sending an email to the owners of SplitTheoryDesigns.com it is a small custom apparel store.