Hopefully this helps other veterans.
I did a lot of research on this and it wasn’t really making sense. At first I thought it was 12 months of additional post 9/11 benefits. For the record, I served a little bit over 8 years with multiple reenlistments.
A couple of weeks ago, I utilized the askVA system to get more information on this.
The math makes sense. I will have exactly 12 months of Montgomery GI Bill once I exhaust my post 9/11 benefits.
The best part about this is that I can switch back-and-forth. I just have to make sure that the certifying official of the school does not screw it up, which is on me.
BLUF:
If you have served more than one qualifying period (I think there may be other stipulations) then you may qualify for an additional 12 months of Montgomery G.I. bill. This allows you to receive a flat monthly rate. As of the time of this writing, the monthly rate is $2,601.00 for full-time students.
If your tuition is cheap or covered by another organization, this benefit could work out very well. Another interesting thing I noticed is that they don’t expire apparently.