WASHINGTON — Gen. Charles Q. Brown Jr. is known for being steady in a storm. There was the time in 1991 when his F-16 was struck by lightning and he had to eject into the alligator-infested Everglades, earning the call sign “Swamp Thang.” The time in 2020, just days before his Senate confirmation vote to be Air Force chief, when he spoke quietly but forcefully in a video of the many African Americans who have suffered the same fate as George Floyd. And there was this summer, when his confirmatio