Clue32, I retired two years ago and if I remember the last paycheck was held for about 5 -7 days for one last audit. It was explained to me that it is Uncle Sam’s last chance to square the record if there are any claims that are due. Don't forget permissive TDY and travel days for you and the family. That will back up the actual date you sign out by at least a few weeks. One note on your DD214, it will be prepared in advance and held until the last day your in the Army, if you have any awards that don't make it onto it by that date will be impossible to have it added later, (unless you are in the Guard or Reserve later.) I found out that the hard way, the unit was dragging their feet and didn't get the final award until it was too late, so I ended up with a add on sheet to the final DD124, I think it is a DD214-1 or a DD215, anyway it is a halfa$$ way to correct this important document.
Best of Luck to you. I also flew the C-12C/F/J, C-21A and UH1 under the Clue callsign, 94-97.