You are authorized to wear a star on your Vietnam Service ribbon for each campaign you participated in. Check the dates listed below and you can determine how many campaign stars you are entitled to.  Most of these campaigns were established long after the end of the period.

An organization is given campaign participation credit if it actually engaged the enemy in combat, was stationed in the combat zone, or performed duties either in the air or on the ground in any part of the combat zone during the time limitations of the campaign. Service stars are worn on the service and campaign medals to denote participation in campaigns. The following is a list of campaigns for the Vietnam War.

• Vietnam Advisory Campaign, 15 March 1962--7 March 1965.
• Vietnam Defense Campaign, 8 March 1965--24 December 1965.
• Vietnam Counteroffensive, 25 December 1965--30 June 1966.
• Vietnam Counteroffensive, Phase II, 1 July 1966--31 May 1967 (Arrowhead authorized only for members of the 173d Airborne Brigade who actually participated in a landing in the vicinity of Katum, RVN, between the hours of 0900-0907, inclusive, on 27 February 1967).
• Vietnam Counteroffensive, Phase III, 1 June 1967--29 January 1968.
• TET Counteroffensive, 30 January 1968--1 April 1968.
• Vietnam Counteroffensive, Phase IV, 2 April 1968--30 June 1968.
• Vietnam Counteroffensive, Phase V, 1 July 1968--1 November 1968.
• Vietnam Counteroffensive, Phase VI, 2 November 1968--22 February 1969.
• TET 69 Counteroffensive, 23 February 1969--8 June 1969.
• Vietnam Summer-Fall 1969, 9 June 1969--31 October 1969.
• Vietnam Winter-Spring 1970, 1 November 1969--30 April 1970.
• DA Sanctuary Counteroffensive, 1 May 1970--30 June 1970.
• Vietnam Counteroffensive, Phase VII, 1 July 1970--30 June 1971.
• Consolidation I, 1 July 1971--30 November 1971.
• Consolidation II, 1 December 1971--29 March 1972.
• Vietnam CEASE-FIRE, 30 March 1972--28 January 1973.