LIST OF WARS: DETAILS
Battle deaths: 1,461,050 
Onesided violence: 587,000 
Nation(s) involved and/or conflict territory [note]
Vietnam, United States, Australia, New Zealand, Thailand
Fighting on one side was a coalition of forces including the Republic of Vietnam (South Vietnam or the "RVN"), the United States, South Korea, Thailand, Australia, New Zealand, and the Philippines. Fighting on the other side was a coalition of forces including the Democratic Republic of Vietnam (North Vietnam) and the National Liberation Front, a South Vietnamese guerrilla movement known in the U.S. as the "Viet Cong". The USSR and People’s Republic of China provided intermittent military aid and diplomatic and moral support to the North Vietnamese and to the NLF, but they were not military combatants.
The war was part of a larger regional conflict involving the neighboring countries of Cambodia and Laos, known as the Second Indochina War. In Vietnam, this conflict is known as the American War (Vietnamese Chiến Tranh Chống Mỹ Cứu Nýớc, literally War Against the Americans to Save the Nation). Many experts consider the war to be a larger battle in the then-ongoing Cold War.
Excerpt from article from the free dictionary Wikipeda: READ MORE
SOURCES: FATALITY DATA
 Battle deaths: PRIO Battle Deaths Dataset v3.0 (link) (1946-88) ID: #96
Low: 1,134,053 High: 4,635,527
 Onesided violence: PRIOdb3 Documentation pp 579-580, citing Clodfelter (2002). High estimate 3,75M. Clodfelters numbers seem to include civilan deaths from militiary battle and onesided violence but not excess deaths due to famine or disease.
NOTE ON NATION DATA
NOTE! Nation data for this war may be inconlusive or incomplete. In most cases it reflects which nations were involved with troops in this war, but in some it may instead reflect the contested territory.
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