Five external fuel tanks tell us this is the tanker version of the A-6 Intruder. The KA-6's kept their grey-white scheme longer than the A-6Es.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/109661044@N07">Rob Schleiffert</a> from Holland
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/109661044@N07/14084939286/">KA-6D USS Nimitz</a>