However, it's important to remember that these numbers can fluctuate and there are no guarantees.

That number seems a bit high to me, but I've seen it fluctuate over time with different tenants.

Theres one in the post called dynamic pricing that fluctuates your prices based on seasons, local events, etc.  

I struggled to get lending because of a lower credit score and some recent fluctuation in employment.

Cap rate will fluctuate for many reasons, but a pretty common reason is supply and demand.  

Usually not a salaried position but multiple hourly retail jobs that fluctuate in hours or multiple people in the house contributing to equal the rent payment.

Obviously, we all hope that we won't get entangled in foreign wars anymore, but you never know of course.Now if you consider places such as San Antonio military towns, then that's obviously a whole different scenario - plenty of other ways to absorb fluctuations.

But be aware that fluctuations in this market are amplified, so projects here are riskier, particularly rehabs that take several months.If you want to buy and hold, go somewhere else.  

Historic fluctuations around 2%, we are at record lows so hard to imagine lower.

That doesn't mean buy a bad deal but small fluctuations aren't going to matter especially if you plan to buy and hold.