If you were not planning on moving so soon, I would be stronger in urging you to make the extra payments.
Once it is paid forward, that money is theoretically 'gone' for now....until you sell down the road.
So make sure that you save cash for home improvements and emergencies.
Something that I have seen is to make sure that you have all your insurance up to date while being deployed.
I had friends and family who lost nearly everyting during Katrina while being deployed over seas.
I know this is an extreme example, but a lot can happen while you aren't around.
Best of luck and thank you for your service to the US!
I believe your gut feeling is right on target. Since you are military you will not gain much in putting it on the equity of your home. Invest on something that is sound and will give you a good return.