Should I stay in the military a few more years to invest?

[Ibrahim Yamini]

Hello everyone!  This is my first time using biggerpockets.com's website and I've found the information on YouTube extremely helpful.

I will hit 20 years in the Air Force in January but I've extended until June of 2021 to complete a deployment.  

I currently have a remaining balance on my primary house of $222K which we pay $1515 a month. I recently found out that I have enough entitlement with my current VA loan to buy a investment property up to $265K. I would likely use $125K or less

My wife and I talked about it and agreed to buy an investment property when I come back next year.  At that time, I'll have the option to extend my military service for 24 months, or to re-enlist for 4-6 years.  

Should I extend my military service so I have a steady income coming in, or should I just live on my retirement and my wife's income, which will likely be less than 50% of what I'm making now to focus on investing full time?

Thank you for any input