YH-19 ser.no. 49-2014 in Korea - camouflage?

In Robert Jackson's book _Air War Korea 1950-53_, there is a picture of a USAF YH-19, ser.no. 49-2014, which is one of the first few helicopters
of this type deployed to Korea. As the picture is B&W, I am wondering about the colors of this helicopter. It would seem that the base color is Olive Drab, but there is a distinctive mottled pattern. What color are those spots?
-Lasse
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