Picked up these two shots from eBay this afternoon. The first, 41-633, wears the field code V, assigned to the British Flying Training School #1 at Terrell, TX. Behind it is a BT-13 with a suffix code F, most likely from Freeman Field in Indiana.
Captioned "Schmidlap in the cockpit of an AT-6":
Next is 42-85553, based at Aloe Field. Captioned "Left to Right Orlick, Ingleman and me. The airplane is an AT-6. It was almost new and had only a few hours on it."
The code appears to be 52W, unfortunately "Orlick" and "Ingleman" had to go and stand in front of it
That's one jdvoss needs for his Fuselage Codes site:
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All right, Mister Dorfmann, start pullin'!
Pilot: "Flap switch works hard in down position."
Mechanic: "Flap switch checked OK. Pilot needs more P.T." - Flight report, TB-17G 42-102875 (Hobbs AAF)