Here is a link to the TOIH Air Force page:
http://www.tioh.hqda.pentagon.mil/Catalog/Category.aspx?grp=1&menu=Uniformed%20Services
I didn’t find you old unit either. You might try the USAF Historical Research Agency website: http://www.afhra.af.mil/
This is not my image, but this is the insignia I wore from 1978-81:
My point was that the TOIH website didn't have a current Air Force fighter wing's insignia, so it isn't an exhaustive source for every single authorized insignia.
In their "about" page, they say that digitizing unit insignias is an ongoing process, and far from being complete.