In my opinion either shade is correct depending on what crew member/situation you wish to portray.
The red tint goggles would have been used by machine gunners, the green tint goggles at night for adaptation in darkness.
AO stands for American Optical. Those are really nice goggles.
I know there's some very well known pictures of tankers wearing them but I can't seem to find them right away. When I do I will post them here. In any case the green tint goggles would be correct if you want to portray a tanker who is taking part in a night time manoeuvre. (they were very much used by air crews for this reason as well)
Edited by ken88, 11 March 2018 - 02:01 AM.