I was in the Navy at the time serving on a Destroyer, U.S.S. Walker (DD517). We were on our way back from Vietnam with several other ships. Being a Signalman, I was on the bridge when I received a message by flashing light that the President had been shot. I remember it so well. Not only because of the content of the message but also because it was a “flash” message which was of the highest priority and the only one I ever received.
I suppose, to be on the safe side, our group of ships turned around for a time and headed back to the Western Pacific until more information came in.