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http://virtualglobetrotting.com/map/mcdonnell-douglas-yc-15/
I think this is the other prototype is here:
http://tinyurl.com/yex7dtz
72-1875 (cn CX001): AMARC (Davis-Monthan AFB) -> Pima Air & Space Museum -> Air Force Plant 42 (Palmdale) -> Air Force Flight Test Center Museum's "Century Circle" (Edwards AFB)
http://www.airliners.net/search/photo.search?regsearch=N15YC
72-1876 (cn CX002) : AMARC
http://www.airliners.net/search/photo.search?regsearch=72-1876&distinct_entry=true