The Sergeant Major of the Marine Corps issued a video message with some straight talk for Marines on the issue of sexual assault prevention. [HTML1] Sgt. Maj. Mike Barrett told Marines in the passionate message posted Tuesday to “step in and do something.” When the Corps has a problem within its own ranks, they have to own it and fix it, he said. “There’s never a wrong time to do the right thing,” Barrett said. “Remember who you are. … Remember who we are.” The message introduces the Defense Department’s theme for the 2013 Sexual Assault Awareness Month, which is…