From the American Thinker link:
“[Acting Navy Secretary Thomas] Modly is the responsible, accountable official to the American people. And he had reason to believe that the captain operated outside the chain of command and he relieved him,” Milley told Fox News’s Outnumbered Overtime on Friday.
Milley said there is an ongoing investigation into what happened, but he trusted Modly and his judgment and would support him.
He added, “The secretary of the Navy is responsible to the American people for the good order and discipline of the Navy. And when he loses trust and confidence in a ship’s captain, then that’s it. It’s target down. And we’re moving on to the next, to the next task.”
[snip]
Modly said Crozier had cc’ed more than 20 people, including some outside the chain of command, over unsecured and unclassified systems, assuring the memo’s leak.
He also said Crozier did not speak to his direct superior, carrier strike group commander Rear Adm. Stuart Baker, about his concerns before sending the memo, despite Baker being on the carrier and living within feet of Crozier.
Modly said Crozier was not fired for expressing concerns, but the way he chose to do so.
And Modly was fired not for expressing his concerns but the way he did so. (You can call it a resignation but he knew he would be fired if he didn’t go on his own)