The "V" device is a bronze block letter, V, 1/4 inch (.64cm) high with serifs at the top of the members. It is worn to denote participation in acts of heroism involving conflict with an armed enemy. It was originally worn only on the suspension and service ribbons of the Bronze Star Medal to denote an award for heroism (valor). Effective 29 Feb 1964, the "V" device was also authorized for wear on the Air Medal and Army Commendation Medal for heroic acts or valorous deeds not warranting awards of the Distinguished Flying Cross or the Bronze Star Medal with "V" device. Effective 25 Jun 1963, the "V" device was authorized additionally for wear on the Joint Service Commendation Medal when the award is for acts of valor (heroism) during participation in combat operations. In the case of multiple "V" devices for the same award, only one "V" device is worn on the service ribbons.