@Richard Prillerman
One of this big things to keep in mind (which was alluded to above) is that if the service member gets put on PCS orders, they can exit a lease with no penalty. There might be a few that try to take advantage of you on that but I can speak from personal experience that sometimes PCS orders can be as much of a surprise to the service member as it would be to you as the landlord.
I would also be mindful of those that have not been in the military long because most junior service members (but definitely not all) will have gone straight to living in barracks after graduating high school, and have never had a house of their own to take care of, potentially bringing you similar issues as college students. NCOs and Officers usually have been around long enough to know better.
One of the big Pros of a military tenant is they always have a guaranteed paycheck coming. You can google how much Basic allowance for housing (BAH) a service member will get paid in a zip code depending on their rank and if they have dependants. This gives you a great starting point for how much they can afford to pay for rent.
Overall, most service members are great tenants that will do the right thing and not destroy your place or leave unexpectedly.