I am 25 years old, single, and active duty.

There are lots of active duty and veterans on these forums that are also real estate investors (myself included).

When he doesn't respond, file a small claims court suit (99% likely it can be done online) and have him served through the court (usually it is an off duty police officer).

Instead of dealing with just one person/family, you have anywhere from 3, to 9 or more individuals on the Boards, NONE of whom usually have much practical knowledge relating to their duties, and often very different motivations for being on the Board.Second place would be Owners that never learn how to read and use their monthly financial reports; and those that insist on quick, easy, and cheap fixes, rather than making proper repairs that actually solve a problem.Third place goes to inherited tenants, that typically have a lot of bad habits and unreasonable expectations when we takeover management of a property.Least likely to be a PITA are tenants I have screened and placed.

I am active duty Military and a Realtor®️ with Watson Realty Corp at Oakleaf.

It's a lot of things, a lot of emotions happening at once.That's why I put these six tips for you about PCS-ing to Hawaii.Tip #1 Begin your preparation as soon as possible because this might be the biggest move of your life unless you've gone to Korea, Italy, or any of those other duty stations.

Letting potential buyers know who the local mail thief is, is just part of their duties. 

I am currently in the Camden, SC area about 20 minutes East of Columbia, and I am Active Duty Air Force about 2 years from retirement. 

@Brett Johnsonconsult some qualified professionals, but one could question if you are following the Realtor Code of Ethics and your fiduciary duty to the public, maybe. 

Anyway, the upshot of all that is just keep doing what you're doing, with a notice to the tenants that you have assumed PM duties and updates regarding everything referring to the PM (where to send rent, send notice, etc) referring now to you.