while metal detecting found a US ARMY ADVANCE FLYING SCHOOL..1933 ring (goldring)

[boltaction]

Well, it might well be worth more than the gold content, but I can't imagine you would need us to tell you that. The ring seems to have initials on it. I expect that there is probably a website where you could search the initials/owner, since you have the date he was in the Corps. Probably Ebay would be an excellent venue for selling that ring, as it would appeal to US militaria collectors, ring collectors, and collectors of air related stuff.

Ed