The latest detail to emerge in the aftermath of Wednesday’s fatal shooting at the U.S. Holocaust Museum is that one of the two surviving security guards who returned fire at the alleged gunman was a recently retired Metropolitan Police Department officer. Harry Weeks retired from the MPD in February after 27 years as a D.C. police officer. The second guard, Jason “Mac” McCuiston, is a former Marine who had worked as a police officer outside Atlanta. Weeks and McCuiston both opened fire on James von Brunn after the suspect shot security officer Stephen Johns. The two surviving guards had only been working at the museum for a few weeks.