The original concept of an Overseas Bar began in the First World War with what was known as an Overseas Chevron. An Overseas Chevron was an inverted chevron patch worn on the lower left sleeve on the standard Army dress uniform. The chevron was identical to the Wound Chevron which was worn on the opposite right sleeve. During World War II, the chevron was redesignated as the Overseas Bar and the patch adopted its current design of a horizontal bar. For those who had performed overseas service in both the First and Second World Wars, the Overseas Bar and Chevron were worn simultaneously. By the time of the Vietnam War, the Overseas Service Bar had adopted its current name and the patch was now worn on the lower right sleeve, instead of the left.