Am I the only one who believes Blondie returns his half of the stolen money to the Army?
Reason one: he will get a reward for the $125k which would be substantial and he would not have to worry about being caught.
reason two: he developed great sympathy for the plight of the soldiers and would want them to get their deserved pay
reason three: he was broke at the start of FOD
bruce marshall 
The other plus is that it would also take Tuco off his back. As it is now, Blondie has to worry the rest of his life about Tuco catching up with him. You can't steal from Tuco and get away clean.
OTOH, if Blondie were going to give money back, why not take all of it back? Why leave any of it with Tuco? The feds are gonna get half and Blondie's explanation is that the other half is with a guy he knows? If I were on the receiving end of that proposition I'd be suspicious that Blondie was holding out on Uncle. Maybe Blondie wants a clean slate with the gov AND half the stolen money. I think I'd have Blondie committed to Betterville 2 and see if Cpl. Wallace's brother can get any more info out of him.