BOTH INTERNATIONAL & INLAND For identification purposes at night, U.S. Navy submarines on the surface may display an intermittent flashing light of which color?

Correct Answer: Option D — Amber (yellow)

Rule 1(d) allows for special rules made by the government for ships of war. Under 33 CFR 83.01(d), U.S. Navy submarines are authorized to display an intermittent flashing amber (yellow) beacon for identification purposes when operating on the surface, as this light is not otherwise used for standard navigation lights.