Retired Sgt. 1st Class Louis S. Diggs, Korean War veteran and member of the 231st Transportation Battalion, speaks about the history of the "Monumental City Guards" during the ceremony celebrating the 231st Transportation Truck Battalion's 135th anniversary of their establishment as an all-black independent militia company during a ceremony at the War Memorial in Baltimore city on Feb. 22, 2014. (Photo by Staff Sgt. Michael Davis Jr., 29th Mobile Public Affairs Detachment.)