Dear Amy (und Völker),
I'm sorry to keep citing a book that you as of yet still don't own, but, according to Sloan's
WINGS OF HONOR, a mistaken identification has been made:
[page110, bottom left corner]
"Lt. Alfred Grant became C.O. of the 27th Pursuit Squadron as Major Hartney took over the 1st Pursuit Group. This photograph [the same as the one Völker linked and the one appearing here at The Aerodrome's ACES; but these photos appear to have been reversed] is reported to be Lt.
Joseph Wehner, per National Archives photo file P-1454 but is positively identified as Grant, square -jawed, stern, and an excellent pilot. [Photo courtesy H. Hugh Wynne)"