Thank you all
@ the Brits :
RB-69A, CIA spy P2V-7s: previously under Navy cover, so Navy blue. Later, marking changed for USAF,
AP-2E, US Army ELINT P2V-5Fs: less modified planes so still very much looked like a Navy Neptune,
OP-2E, US Navy gunship P2V-5Fs: rapidly painted on top and sides in jungle green (even lightly the white star) to drop sensors over the Ho Chi Minh Trail,
AP-2H, US Navy night gunship P2V-7Fs: camouflage that remind WWII night fighters.
@ Rodondo: I don't know.