I had something similar happen when I returned from an OCONUS tour. I kept getting paid COLA even though I made three trips to the finance office to stand in front of them with my LES ,ID card and orders bringing me back to CONUS to prove I was no longer OCONUS. Kept up for 4 months. I stuck the extra cash into a money market account I had and made a little interest on their mistake before they wised up and I got a $200 LES. I think the national average on 6-month CDs is running just under 3% right now.
