As with most photographic-reconnaissance airplanes, the pilot was provided with a periscope so he could orient the airplane for pictures taken by his downward-oriented cameras. The A3D-2P had two periscopes, one for the pilot to position the airplane over the area of interest and one for the photo-navigator in the right seat to trigger the cameras to take pictures of it.
This is a work in progress and to paraphrase Captain Barbossa, specifications are more what you'd call "guidelines" than actual "rules". For example: https://tailspintopics.blogspot.com/2012/06/markings-cautionary-example.html and https://tailhooktopics.blogspot.com/2019/05/grumman-f9f-8-upper-control-surface.html
Summary, 1940 to Gray/White: