Update 1955 21 Dec: Here's the Navy Times story on the firing. Excerpts:
Cmdr. Christopher Henry, who took command of the submarine Aug. 7, was relieved as a precautionary measure, said Lt. Cmdr. Greg Kuntz, spokesman for Submarine Group 7 in Japan.Only four months in command really doesn't seem like enough time for a CO to get a fair shake, so some pretty scary stuff must have happened. I don't know Commodore Wright, but I trust RADM McAneny to make the right call.
Henry’s relief was due to a “loss of confidence in ability to command,” Kuntz said.
Capt. Doug Wright, commodore of Submarine Squadron 15, removed Henry after assessments were conducted on the ship, evaluating operations and overall trends...
... Kuntz said Henry’s relief from the post was not attributable to a specific item or incident, but to overall trends.
“The conduct of operations fell short of high Navy standards,” Kuntz said. Operations on the submarine had been conducted at a safe level, Kuntz said, but were still enough of a concern that it brought about Henry’s relief of duty.