Gunnery Sgt. Monica Preston, assistant drum major,

Gunnery Sgt. Monica Preston, assistant drum major, “The President’s Own” U.S. Marine Band, executes “pass in review” during Ceremonial Drill School (CDS) evaluations at Marine Barracks Washington, D.C., Jan. 28, 2020. The three-week CDS course teaches Marines the fundamentals of ceremonial drill that is unique to the “Oldest Post of the Corps.” (U.S. Marine Corps photo by Lance Cpl. Allen Sanders)