But still, being in a shipping traffic lane? Kind of like why seat belts are worn when we drive, suitable gear on motorcycles etc. even if it wasn’t a legal requirement. The other guy might do something stupid.
The only time life jackets are worn is during general quarters. Makes sense.
Just not done, Life Jackets in calm seas impede the ability to function. They are bulky compared to a Life Vest for combat. Flight deck crews wear reflective ones like crossing guards wear. Just not a typical on deck wear except in rough seas. May sound stupid to those not in Navy, but that is how the Navy operates. It’s not changed since hubby was a Sailor working the Flight Deck, and he’s been retired since the 80’s.