When you go to look it up, us Light Gull Gray as your search term. (36440)
Believe me, if you painted your model in Gull Gray, it would "funny" to your eye (36473) (also, 36473 was not one of the US colors during the Vietnam war)
After 1971, the color on the aircraft changed just slightly, and so did the name, the USN changed the name to Light Gray and the aircraft started being painted in Gloss (16440).
You don't need to look up the arguments about color, just get Testors Flat Light Gull Gray, and Gloss Light Gull Gray, paint both on something next to each other, and you will see the difference. This is because Testors designed their paint colors for the Model Master line *before* the GSA mistake of 1984, correctly getting colors different when they were in real life.
In real life, the colors were allowed to vary 5% lighter and 5% darker than the standard, when received new,,,,,,and faded more than that once applied.
This means that you have a very wide range of colors to have on your model, and still be "correct",,,,,,,,,,heck, you can paint a pre-1971 aircraft with the post-1971 paint, and since about 1/2 of all modelers "don't believe" in the differences,,,they will see it as *perfect*.
I hope this helps,,,,,,and I hope this serves as good reasoning as to why you should just "pick your favorite color" and run with it.
Rex