On a recent weekday, some three dozen Marines and civilians filed into an auditorium at Henderson Hall, a Marine support center on a hill above the Pentagon.
They were there to talk about extremism in the ranks.
They reviewed their oath to defend against any enemy foreign or domestic, learned about active service members arrested for stockpiling weapons as members of neo-Nazi and other extremist groups, and took part in a wide-ranging discussion that included race, values and how to report suspicious activity.