Remaining Pattons deployed to South Vietnam were in three U. S. Army battalions, the 1-77th Armor near the DMZ, the 1-69th Armor in the Central Highlands, and the 2-34th Armor near the Mekong Delta.

The PASGT vest replaced the M-69 Fragmentation Protective Body Armor nylon vest that was used during the Vietnam War, which in turn replaced the M-1952A Fragmentation Protective Body Armor that was used during the Korean War.

When U. S. forces returned from Vietnam, the 1st Cavalry Division went through a testing process as a TRICAP ( Triple Capacity: Armor, Infantry, and Air Cavalry ) unit before being converted to an armored division, leaving the 101st as the only airmobile ( renamed air assault in 1974 ) division in the Army.

* 1966 – Vietnam War: the Battle of Long Tan ensues after a patrol from the 6th Battalion, Royal Australian Regiment clashes with a Viet Cong force in Phuoc Tuy province.

* 1972 – Vietnam War: The Battle of An Lộc begins.

* Battle of Coral-Balmoral, a series of actions in May and June 1968 during the Vietnam War

* 1971 – Vietnam War: The Battle of Long Khanh between Australian and Vietnamese communist forces begins.

* 1965 – Vietnam War: The Battle of Dong Xoai begins.

* 1785 – Invading Siamese forces attempt to exploit the political chaos in Vietnam, but are ambushed and annihilated at the Mekong River by the Tay Son in the Battle of Rạch Gầm-Xoài Mút.

* 1968 – Vietnam War: North Vietnamese and Viet Cong forces attack Australian troops defending Fire Support Base Coral, east of Lai Khe in South Vietnam on the night of 12 / 13 May, resulting in heavy casualties on both sides and beginning the Battle of Coral-Balmoral.

* 1969 – Vietnam War: The Battle of Dong Ap Bia begins with an assault on Hill 937.

* 1969 – The Battle of Hamburger Hill in Vietnam ends.

* 1968 – Vietnam War: Battle of Lima Site 85, concluding the 11th with largest single ground combat loss of United States Air Force members ( 12 ) during that war.

* 1965 – The 173rd Airborne is ambushed by over 1, 200 Viet Cong in Operation Hump during the Vietnam War, while the 1st Battalion, Royal Australian Regiment fight one of the first set-piece engagements of the war between Australian forces and the Vietcong at the Battle of Gang Toi.

* 1965 – Vietnam War: The Battle of the Ia Drang begins – the first major engagement between regular American and North Vietnamese forces.

* 1967 – Vietnam War: The Battle of Dak To begins.

China and South Vietnam both occupied portions of the Paracel Islands until 1974, when the Battle of the Paracel Islands occurred ; China took over and has controlled all of the Paracel Islands since then.

** The Battle of Dong Ap Bia, also known as Hamburger Hill, begins during the Vietnam War.

** Vietnam War – Battle of Khe Sanh: One of the most publicized and controversial battles of the war begins, ending on April 8.

* March 7 – Vietnam War: The First Battle of Saigon ends.

* March 10 – 11 – Vietnam War: Battle of Lima Site 85, largest single ground combat loss of United States Air Force members ( 12 ) during the then-secret war later known as the Laotian Civil War.

* August 18 – Vietnam War – Battle of Long Tan: D Company, 6th Battalion of the Royal Australian Regiment, meets and defeats a Viet Cong force estimated to be 4 times larger, at the in Phuoc Tuy Province, Republic of Vietnam.

** Vietnam War: Battle of Ong Thanh

* November 3 – Vietnam War – Battle of Dak To: Around Dak To ( located about 280 miles north of Saigon near the Cambodian border ), heavy casualties are suffered on both sides ( the Americans narrowly win the battle on November 22 ).

* June 10 – Vietnam War – Battle of Dong Xoai: About 1, 500 Vietcong mount a mortar attack on Dong Xoai, overrunning its military headquarters and the adjoining militia compound.

* 1945 – August Revolution: Viet Minh led by Ho Chi Minh take power in Hanoi, Vietnam.

Japan took Vietnam from France and the Axis-occupied Vietnam was declared an empire by the Japanese in March 1945.

The Chinese Yunnan provincial army, under the KMT, occupied northern Vietnam after the Japanese surrender in 1945, the VNQDD tagging alone, opposing Ho Chi Minh's communist party.

* 1945 – World War II: The Empire of Vietnam, a short-lived puppet state, is established with Bảo Đại as its ruler.

* 1945 – Vietnam declares its independence, forming the Democratic Republic of Vietnam.

* National Day, celebrates the independence of Vietnam from Japan and France in 1945.

The current Vietnamese state traces its direct linage back to the Democratic Republic of Vietnam ( North Vietnam ) and the 1945 August Revolution led by Hồ Chí Minh.

During this period, his son, future ABC newsman, Jack Smith ( April 25, 1945 — April 7, 2004 ), was serving with the U. S. Army 7th Cavalry Regiment in South Vietnam and fought at the Battle of Ia Drang.

After persuading Emperor Bảo Đại to abdicate in his favour, on September 2, 1945 President Ho declared independence for the Democratic Republic of Vietnam.

In September 1945, after the Japanese withdrawal, Hồ Chí Minh proclaimed the Democratic Republic of Vietnam, his Việt Minh began fighting the French.

When the Japanese surrendered in 1945, Emperor Bảo Đại abdicated, and Viet Cong leader Hồ Chí Minh proclaimed the Democratic Republic of Vietnam ( DRV ) in Hanoi.

After 1945 Trotskyism was smashed as a mass movement in Vietnam and marginalised in a number of other countries.

* Empire of Vietnam ( March – August 1945 ) – Emperor Bảo Đại's regime with Tran Trong Kim as prime minister after proclaiming independence from France.

The Japanese promised not to interfere with the court at Huế, but in 1945, after ousting the French, coerced Bảo Đại into declaring Vietnamese independence from France as a member of Japan's " Greater East Asia Co-Prosperity Sphere "; the country then became the Empire of Vietnam.

Japan surrendered to the Allies in August 1945, and the Vietminh under the leadership of Hồ Chí Minh aimed to take power in a free Vietnam.

Bảo Đại was appointed " supreme advisor " to Hồ's Democratic Republic of Vietnam in Hanoi, which asserted its independence on 2 September 1945, but was ousted by the French in November 1946.

After the nationalist organizations proclaimed the independence of Việt Nam, Hồ proclaimed the Democratic Republic of Vietnam on September 2, 1945.

* The Wars for Vietnam: 1945 – 1975.

Although French administration was allowed during Japanese occupation as a puppet government, Japan briefly took full control of Vietnam in 1945 under the Empire of Vietnam and Tonkin became the site of the Vietnamese Famine of 1945 during this period.