The Vietnam Distinguished Service Order was a military decoration of South Vietnam which was awarded throughout the years of the Vietnam War. The decoration was bestowed for meritorious or heroic deeds related to war time operations and was awarded for both combat and non-combat service. There were two classes of the Vietnam Distinguished Service Order, the first class being for officers and the second class for enlisted personnel. The first class of the order was differentiated by a blossom device centered on the medal and ribbon.