Before World War I, service member's free mail was usually marked soldier/sailor's mail or officer's mail. This officer's mail cover was censored and mailed from France.
March 5, 1918
handwritten return address in top left corner; handwritten address at center; handwritten "Officer Mail" in top right corner; stamped "A.E.F. PASSED AS CENSORED / [image of American seal] / A. 337" in circular mark in bottom left corner; stamped "U.S. ARMY / MAR 5 / 3 PM / POSTAL SERVICE" in circular cancellation with 7 bar oval killer in top right corner