Hundreds of sailors aboard the aircraft carrier Theodore Roosevelt were cheering Capt. Brett E. Crozier, the commander who sacrificed his naval career by writing a letter to his superiors demanding more help as the novel coronavirus spread through the ship. Senior Navy officials argued that by sending his concerns to 20 or 30 people in a message that eventually leaked to news organizations, Captain Crozier showed he was no longer fit to lead the fast-moving effort to treat the crew and clean the ship.