I received these from a WWII vet that was in China during the war.  His friend took these after the war ended.  He thinks it was in Peishiyi. Is there any way to tell which US squadron these planes came from? Possibly from the tail markings or the nose cone colors?

Attached Image(s)

14th AAF 23rd FG 118th TRS

I found one book that shows one with a red nose, two red horizontal stripes on the top of the tail, and the number 1712, with blue and white spaced striped on the rudder.  11th Fighter Group, Chinese Air Force, Hsien, China, 1945.  William Hess writes that the 3rd and the 5th Fighter Groups of the Chinese-American Composite Wing (CACW) operated Mustangs in 1944-1945.  Another book verifies 11th FG, Chinese Nationalist  AF, beginning of 1945.

"Arguably, the Mustang was the best [single-engine] fighter plane that ever flew...."

James.......P-51D 1712 was ex-75FS / 23FG; you can still make out their markings though the've been removed; black tail with diagonal front edge, black diagonal stripe in front, 75's flying tiger shark insignia in front of star, 2-digit number (looks like 76 ) on lower cowling. On the photo in my book you can seen where the bars have been scraped off the US insignia and CAF star in place.

I THOUGHT the 11FG CAF only had P-40s in WW2 and P-51s post-war but not certain.
The 2 CACW fighter groups ( 3rd and 5th ), I believe, did not have Chinese blue-white bands on the rudders, nor spinner colours (as standard anyway).
Chinese Mustangs had 4-digit numbers on the fin, below the CAF "P" serials.
Carl (Molesworth) can probably fill in better.............  Nick