I am looking for the training base code letter that was applied to the outside of various aircaft during WWII (e.g. BT-13, AT-6, AT-11, etc. The letter was painted black was about 3 or more feet high and would has numerics assicated wth it (e.g. "B54")In particular I am looking for the letter assigned for the following bases:

Enid AAF BT-13
Pecos AAF BT-13
Goodfellow AAF BT-13
Moore Field AAF AT-6
Kelly Field AT-6
Marfa AAF AT-9
San Marcos AAF AT-7
Pampa AAF AT-9
Hondo AAF AT-7
Lubbock AAF AT-9
Midland AAF AT-11
Waco AAF AT-9
San Angelo AAF AT-11
Childress AAF AT-11
Ellington AAF AT-9
Pyote AAF ???


Any help would be appreciated!!

JohnV