If you are a junior enlisted Coastie, you might have wondered if you missed the memo April 3 when you went in to work. Your chief was looking sharp in his or her service dress blues, and you were wearing your ODUs. But the chiefs wore their SDBs on Wednesday to bring attention to a serious issue: sexual assault in the Coast Guard, said Command Master Chief R. Shane Hooker, command master chief for the deputy commandant of mission support at Coast Guard Headquarters. April is Sexual Assault Awareness Month. The service had 156 reported cases of sexual assault in…