About 1,000 sailors from the aircraft carrier USS Theodore Roosevelt – roughly a fifth of its crew – were under quarantine at a U.S. naval base on Guam on Thursday as the Navy sought to control a coronavirus outbreak aboard the warship. The evacuation of sailors from the vessel began on Wednesday, a week after the first coronavirus case was reported on the aircraft carrier, and followed public disclosure of a scathing letter to Navy command from the ship’s captain urging “decisive action” to control the outbreak. In his four-page letter, the contents of which were confirmed by U.S. officials to Reuters on Tuesday, Captain Brett Crozier described a bleak situation aboard the nuclear-powered carrier as more sailors tested positive for the virus.