WASHINGTON (AP) - As President Donald Trump’s supporters massed outside the Capitol last week and sang the national anthem, a line of men wearing olive-drab helmets and body armor trudged purposefully up the marble stairs in a single-file line, each man holding the jacket collar of the one ahead.The formation, known as "Ranger File," is standard operating procedure for a combat team that is "stacking up" to breach a building — instantly recognizable to any U.S.