Under the Pentagon's new anti-extremism policy, troops are still not barred from membership in extremist groups. For the first time, the Department of Defense is including participation in online activities support "the overthrow of the government of the United States." The new guidelines give a more detailed definition of online activity to include posting, liking, sharing, and retweeting. Get a daily selection of our top stories based on your reading preferences. Loading Something is loading. Email address By clicking ‘Sign up’, you agree to receive marketing emails from Insider as well as other partner offers and accept our Terms of...