U.S. veteran Vincent Lewis describes an experience with enemy tactics while serving in an artillery unit during the Vietnam War. The Viet Cong forces learned they could intercept U.S. troops’ communications on the battlefield and order U.S. planes to drop bombs on their own troops. Ever vigilant, U.S. commanders had to keep a watchful eye on the battlefield to avoid “friendly fire” as a result of this practice. This segment from Iowa PBS's Iowans Remember Vietnam documentary includes archival footage and first-person accounts to describe events and experiences of the war.