By MARK SATTER | CQ-Roll Call | Published: May 23, 2021 WASHINGTON (Tribune News Service) — Christopher Warnagiris became the fifth service member, and the first on active duty, arrested for participating in the Jan. 6 pro-Trump insurrection at the Capitol. The Marine Corps major is charged with a slew of federal offenses after video and photographs showed him violently storming the Capitol, pushing through a line of police officers guarding the East Rotunda doors and using his body to keep the door open and pull others inside. His arrest seemingly adds to the growing body of evidence that extremism is fomenting in the military ranks and, according to some lawmakers, defense officials and experts, needs to be addressed.