The Mil-Std specification for modern USN Haze Gray is 26270. Model Master Neutral Gray is 36270, the difference being flat vs semi-gloss. Depending on the length of the cruise, the weather conditions, and the time of day, it photographs as anywhere from light pink to light blue.
(You may choose to lighten the paint out of the bottle neutral gray some for scale effect, but the MM Neutral Gray is my go-to choice).
I also use MM Gunship Gray for decks and MM Engine Gray for new, unworn flight deck no-skid. However it soon weathers to Gunship