Interesting pic of CNAF Curtiss Hawk IIIs. Can you share where you found it? The nearest aircraft is interesting because it appears to have a different colour under the cowling and forward fuselage from the standard dark green applied to CNAF fighters (and as shown on the other airframes in the image). Also, the forward area of the pilot's headrest seems to be a different colour. I'm interested in learning more...if there's more to be learned.