- 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. Troops can now be punished for "liking" or "retweeting" content from extremist groups, according to a new Pentagon policy released Monday. But the Department of Defense still has not banned troops from being members of extremist groups, like the...