The B-25s are from the 1st. BG., Chinese-American Composite Wing; their later aircraft ( P-51s and B-25s) had mixed US--Chinese insignia.Tail nos. on the Mitchells were in the ranges 600--700 as per other 3-digit series in the Fourteenth.
See "cbi-history.com " site ( under CACW ) for the squadron badge ( 4th BS ) on the near plane.
Nick