This is an awesome photograph of Washington’s Metropolitan Police Department in 1922, on their motorcycles. (I’d hate to be the guy riding in the sidecar.) The photo was taken on April 26th, 1922.
Photograph shows a group of motorcycle policemen, from left to right: “Sergt. J.E. Boyle, L.F. Reilly, W.D. Vaughn, F.S. Tyser, L.D. Redman, D.E. Gailmore, G.P. Waite, R.H. Mansfield, G.M. Little, A. Shockey, W.C. Lewis, [and] Capt. J.A. Abbott” with view of the U.S. Capitol in the background.