Distinguished Service Order

The Army Distinguished Service Order (Vietnamese: Lục-Quân Huân-Chương), Air Force Distinguished Service Order (Vietnamese: Không-Lực Huân-Chương), and Navy Distinguished Service Order (Vietnamese: Hải-Quân Huân-Chương) 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 wartime operations and was awarded for both combat and non-combat service.

There were two classes of the Army/Air Force/Navy 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.

The Army/Air Force/Navy Distinguished Service Order was also provided to foreign militaries, and in the United States military the decoration was considered the equivalent of the Legion of Merit. For foreign officers, the 2nd class of the order was also provided to officers.

The decoration ranked immediately below the National Order of the Republic of Vietnam and the Republic of Vietnam Military Merit Medal.