I would look at playing the Wholesaler role, where you locate properties that meet investors' criteria, put those properties under contract, and then either assign the contracts to an investor for a fee (in CA the fee is between $5k - $10K) or you do a joint venture with an investor where you split the risk and the profit (you bring your time and expertise, the investor brings the money).My company manages these types of deals so I can give you more detailed information if you need it.God Bless You!

Also, all the paperwork has him and his wife as joint tenants and both as the borrowers.

Tell them they are jointly responsible for the lease and that if the remaining one does not qualify alone they both need to move out.  

After I remove the appraisal and home inspection contingencies (assuming the house appraised for the value I'm paying and the home inspection didn't reveal any surprises), I have the title company order the title report (I would have already pulled a title profile on the property as part of my due diligence).In CA we use a standard California Purchase Agreement and Joint Escrow Instructions provided by the California Association of REALTORS(R), Inc. 

If he is an agent asking if you wants to do some kind of a joint venture with you where you both can profit

You can also do a joint venture with an investor where you find the property, put it under contract to control it and bring in an investor who has the cash.God Bless You!

Have you considered joint venturing with a money partner or offering a master lease?

And would being married affect our qualification for a second FHA loan since his current mortgage (with only him on it, but once married would be jointly owned, correct?)

And use the proper kind of tape on the joints. 

We also have Joint Base Lewis/Mchord in our back yard, a port, technology, timber, and a few colleges.