The reverse of a 1948 press photograph documenting a California Army National Guard mortar training exercise at Camp San Luis Obispo. A pasted Oakland Tribune clipping dated July 26, 1948 identifies Capt. Thomas Coffin instructing members of the 159th Infantry Regiment's weapons platoon on the 81mm mortar, marking the Guard's first encampment at the base in eight years following World War II. Project: 218645