Residents of West Earl Township served in World War One from 1917 to 1919, including Jacob B. Bear, Daniel C. Boyer, William C. Boyer, Lloyd A. Brown, Martin A. Brown, Leroy R. Buch, Herbert K. Cooper, Elmer R. Dennis, Fred F. Duck, Joel L. Fasnacht, Clinton C. Crabill, Edna S. Crabill, Lester C. Crabill, Walter C. Herr, Harold C. Hoover, Howard N. Hoover, Charles Huyard, Chester A. Keith, Lloyd A. Killian, N. Lee Klopp, Robert P. Leed, Chester L. Leicey, James A. Leicey, Samuel J. Leicey, Lemon M. Leicy, Harvey M. Metzler, Carson E. Myer, John W. Myer, Lester N. Myer, Melvin N. Myer, Melvin E. Raezer, Harry M. Rogers, Clinton S. Rollman, Roscoe F. Rupp, Ralph M. Seldomridge, Harry R. Shiffer, Charles H. Slair, Harry F. Stauffer, I. Grabill Weidman, J. Earl Wolf, Lemon M. Wolf, Walter M. Wolf, Warren B. Wolf, William McK. Wolf, Michael L. Zwally, and Paul L. Zwally. Among them, Joel L. Fasnacht and Carson E. Myer died, Melvin N. Myer, Harry R. Shiffer, Charles H. Slair, and Harry F. Stauffer were wounded, many served overseas, and Edna S. Crabill served as a nurse.