How can someone use a DA 4991 to delete an assignment to Fort Riley?

A DA Form 4991 is a Declination for Continued Service. As in, you are on assignment but you don't have enough time in service to meet the assignment and would have to reenlist. For example, You had been in Germany for three years, your ETS was coming up in months and came down on orders for FT Riley. But, in order to meet that obligation, you would need to re-enlist. But since you don't want to go, that is when you sign a Dec Statement. Being that you are on a hardship short tour, with so much time remaining on your contract, the Dec Statement will do you no good. The only thing you can do is contact your Branch to see if they can find you another place to go. But.....don't hold your breath.

A DCSS only declines to reenlist. A first term statement does exactly the same thing but has no negative impact. Both require the SM to have an SRR that they dont have the time left to meet. Signing a DCSS won't do anything because the Career Counselor didn't give it to them, and the Career Counselor has to process it. They aren't eligible for a DCSS so it would just go into the shredder.
The SRR for returning from Korea is 6 months. The Soldier is already on assignment so the Army will not entertain an IPCOT or FSTE for them.

When is your date of return from overseas or DEROS?