These tanks are getting the “Cullin” hedgerow cutter fitted. The camouflage paint is black over the basic olive drab. I base the conclusion on the fact that the stars are over painted (and almost visible in some cases). Since the over painting is the darker color and the gray scale of the lighter color matches the trucks, I feel that the tanks were olive drab with black bands, rather than olive drab with earth bands.
M4A1 76mm 2nd Armored Division, Normandy (National
Archives)
Another tank from the same unit with another style hedgerow cutter.