Interesting... ANG bird maybe? That's an odd place for the buzz number. At any rate it might be earlier than the 1950s since the buzz number prefix is PF rather than FF; maybe 1948 at the latest?
Edit: I zoomed in on the data block, and tried to make it more readable. I was hoping that top line would name the field it was assigned to, but it's still fuzzy:

It does say U.S. Army rather than U.S. Air Force, so that narrows down the date.