There is strong population growth, above average yields, and properties are available for 25% to 50% of the national average.

I would guess whichever area has the highest potential population growth.  

Population Net Migration In/Out Average Home Price Rent-to-Value Ratio Local Economies/Types of Jobs Income/Property Taxes Landlord or Tenant Friendly Laws Crime Rates Schools

You don't have to run faster than the bear, you just have to run faster than your friend.Well, you are the friend, who does not make it.There are probably more than 10,000 leases signed in the greater Milwaukee market every month (my guesstimate based on population and home ownership rates), so if yours don't get rented, you have to ask yourself why not mine? 

The town is only 297 people, but that includes areas for miles around the town so it is sparsely populated.

Depending on the population growth of the city, my property manager rented my D area property out within 48 hours to Section 8 Tenants.

Specific to the military population, what specific things have your favorite real estate agents done that made you never want to work with anyone else? 

The area is densely populated with 265k ppl in a 3 mile radius, and is lower income in demographic.

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If you look at the population growth and job market you will be able to tell why.