Opinion | Why one of the U.S. military's scarier threats is coming from within its ranks

Law enforcement officials are ramping up security in Washington, D.C., this week because of right-wing chatter about more violence timed to occur March 4. The date has somewhat bizarre significance to conspiracy theorists like followers of the "sovereign citizen" movement and QAnon. The fact that men and women with sophisticated military skills might buy into such theories is alarming. A small number of skilled and motivated extremists could do outsize damage.