Folder: S.F. Districts-Presidio-Thirtieth Infantry.
On back: "ASILOMAR, Calif.---A trench mortar unit, in support of a battalion of the 30th U. S. Infantry, in position to theoretically shell back of hilly terrain in the joint Army-Navy war games along the Central California coast. Scores of warships, thousands of troops and hundreds of airplanes all are participating.".
"Acme Newspictures."