A common question people ask with the threat of military action and possible chances of World War 3 is can they get out of the draft or military service if they have plantar fasciitis. Obviously you maybe able to find a Podiatrist to make Plantar Fasciitis seem worse than it is. Heck, Donald Trump was able to avoid military service with Heel Spurs himself. But here is the thing. Plantar Fasciitis and Hell Spur syndrome can be cured with simple treatments, so the chance of you avoiding service over them are low. The military will just tell you to get some orthotics and take care of the plantar fasciitis.
Again I know, 20-25 years ago you could get out of military service of the draft for having heel spurs but that was then and this is now. Much more is known and much research down. If you have heel spurs you can be in the military. Sorry for bringing the bad news.
Now if you are bound and determined to get out of the draft or military, good news! Somebody wrote a book about all your options. Read it. Maybe the solution lies in there.