| January 1964 |
| 2 | Council of Notables convenes to draft new constitution. |
| 3 | Buddhist convention promulgates charter of Unified Vietnamese Buddhist Church. |
| 4 | Cambodian forces attack RVN unit in An Gian Sector. |
| 6 | Major General Don becomes Commander-in-Chief of RVN Armed Forces. |
| 14 | General Westmoreland named deputy to General Harkins. |
| 17 | RVN dissolves the special Saigon command, puts capital under III Corps. |
| 18 | Largest helilift of war: 115 helicopters carry 1100 troops into Zone D. VC avoid contact. |
| 21 | US Naval team fights cholera epidemic in Saigon. |
| 30 | General Khanh replaces General Minh in a bloodless coup. |
| February 1964 |
| 3 | Kontum city MAAG compound attacked with grenades, 1 US wounded, 1 building burned. |
| 7 | Playboy bar bombed, five US killed. |
| 9 | Pershing Field bleachers bombed, two US killed, 25 wounded. |
| 10 | General Khanh names himself as Premier; General Minh as Chief of State. |
| 11 | Capitol Kinh Do Theater bombed, 3 US killed, 50 wounded. |
| 25 | Assistant Secretary of State for Far Eastern Affairs Hilsman resigns under fire. |
| 27 | Supposedly trapped, VC battalion fights through 2500-man ARVN ring, Dinh Tuong Sector. |
| March 1964 |
| 3 | RVN airborne troops kill 110 VC out of estimated enemy battalion near Cambodian border, Kien Phong Sector. |
| 6 | General Khanh replaces three of four cocps commanders and five of nine division commanders. |
| 8 | Secretary of Defense McNamara visits Vietnam. |
| 14 | 300 VC captured in operation in Kien Phong Sector. |
| 20 | RVN forces mistakenly hit Cambodian town of Chantreau. |
| 23 | Operation PHUONG HOANG 13-14/10, Dien Phong Sector, finds VC battalion in fortified village, kills 126. |
| June 1964 |
| 5 | RVN bombs and burns a 20-mile strip-on Vai Co Orient River along Cambodian border. |
| 20 | Gen Harkins departs MACV. |
| 21 | UN Mission departs from NY to investigate VN-Cambodian border incidents. |
| 23 | Ambassador Lodge resigns; General Taylor named to replace him. |
| 24 | Operation THANG LANG-HAI YEN 79 on the Dinh Tuong-Kien Phuong Sector border kills 99 VC. |
| 25 | Successful attack on VC training camp in Quang Ngai kills 50 VC. |
| 28 | Amb Lodge departs Saigon. |
| 29 | New Zealand Army Engineers Detachment arrives. |
| July 1964 |
| 1 | Mr William Sullivan named minister-counselor of Embassy. Senate confirms Taylor-Johnson appointments. |
| 3 | Mr Millen appointed to direct USOM. |
| 4 | Special Forces camp at Polei Krong overrun, 50 friendly killed. |
| 4 | DRV charges that RVN guerrillas attacked in Laos on 27 June and the DRV coast on 30 June. |
| 6 | Nam Dong SF- camp hit, 58 friendly (2 US, 1 Australian) killed. |
| 15 | Secy McNamara informs press conference that no PAVN units are operating in RVN. |
| 19 | Gen Khanh leads a mass meeting and shouts "Bac Tien!" ("To the North!") |
| 20 | 9th Regt, PAVN 304th Div, cut up in battalion encounters with ARVN in Thua Thien, Quang Nam and Quang Tri Sectors. |
| 22 | National VN Student Association demands nationalization of French property, severance of diplomatic ties. |
| 22 | Gen Ky confirms guerilla raids on DRV to press. |
| 23 | Gen Taylor meets Gen Khanh, disagrees over Khanh's call to go North. |
| 27 | Pentagon announces several thousand additional advisors will go to VN. |
| August 1964 |
| 2 | USS Maddox on patrol in Gulf of Tonkin attacked by 3 DRV PT boats. |
| 5 | US carrier planes hit PT pens and Vinh oil tanks in DRV. |
| 16 | Gen Khanh removed; the Chief of State, Gen Minh, and assumes the RVN presidency. |
| 19 | VC inter-province headquarters in Mekong Valley bombed. VC begin effective 20mm AA fire. |
| 21 | VC ambush in previously cleared area of Mekong Delta disturbs US. |
| 25 | Gen Khanh resigns presidency. |
| 26 | Rioters attack US-supported hospital in Da Nang when guard shoots over heads. |
| 27 | Gens Khanh, Minh, Khiem, agree to lead nation as triumvirate. |
| 28 | RVN proposed to UN Security Council that UN Commission be established to investigate border incidents. |
| 29 | Military triumvirate appoints Dr Oanh to head government. |
| 29 | General Khanh "ill" in Dalat. |
| 29 | Buddhist leaders announce they will pressure for all-civilian government. |
| September 1964 |
| 2 | Under Buddhist pressure, government releases 309 rioters arrested week before. |
| 3 | Khanh replaces triumvirate with 15-member committee, to elect a temporary Chief of State and Prime Minister. |
| 4 | Taylor goes to Washington. |
| 4 | Khiem resigns as Defense Minister. |
| 4 | Khanh announces army people will resign their posts in caretaker government. |
| 5 | 4 Cambodian jets cross border and fire on RVN aircraft and miss. |
| 6 | 1 Cambodian aircraft fires on Chu Muong outpost. |
| 6 | 150,000 Buddhists parade in Saigon at funeral for victims of Buddhist-Catholic rioting. |
| 8 | Government reorganized: Khanh retains Premiership; Minh becomes Chairman. |
| 9 | Khanh abolishes internal press censorship. |
| 12 | State Dept announces no plans for international negotiations on Vietnam. |
| 13 | Abortive coup begins. |
| 14 | Abortive coup ends. |
| 15 | Khanh arrests 5 coup leaders. |
| 15 | Operation TU LUONG 134 near Quang Ngai City results in 80 VC killed. |
| 16 | 2d Tonkin Gulf incident: DRV PT boats attack destroyers Edwards and Morton. |
| 20 | Centering in Bon Sal Pa SF Camp, Quang Duc Sector, Montagnard soldiers begin rebellion against RVN authority. |
| 20 | Opn LAM SON 129, Quang Tri Sector, results in 77 VC killed. |
| 21 | Labor strike cripples Saigon public services. |
| 22 | Korean non-combatant military assistance group arrives. |
| 24 | Strike ends with compromises between labor leaders and Khanh Government. |
| October 1964 |
| 1 | Bac Lien and Chou Doc sectors reinstituted from subsectors of two neighboring sectors. |
| 2 | Khanh announces he will accept a draft call to head government; threatens force to crush further labor protests. |
| 3 | An Xuyen Operation DAN CHI 73, 150 VC killed. |
| 4 | Riot police disperse workers in Saigon. |
| 4 | VC kill 1 US, 40 VN 18 miles from Saigon. |
| 7 | RVN complains to ICC about DRV infiltration. |
| 9 | Brig Gen Vien becomes III Corps commander. |
| 11 | 3 VC battalions, RVN forces, engaged near Go Dau Ha; heavy losses. |
| 14 | Gen Khiem named Ambassador to US. |
| 15 | September 13 coup leaders go on trial. |
| 17 | DAN CHI 80: RVN troops kill 123 VC in 2 day operation on Ba Xuyen-Bac Lien border. |
| 18 | DRV charges US-RVN aircraft bombed DRV village Oct 16 and 17. |
| 20 | RVN gets new constitution. |
| 21 | Khanh's government makes way for new civilian government. |
| 23 | Coup leaders acquitted. |
| 24 | Coup leaders re-arrested. |
| 24 | Suu elected RVN President; Huang Prime Minister. |
| November 1964 |
| 1 | VC shell Bien Hoa Airbase with 81mm mortars, kill 4 US and 2 VN soldiers. |
| 4 | Typhoon Iris hits Central Vietnam causing widespread disruption of communications, and destruction of crops. |
| 17 | USOM allocates flood relief supplies; Marine helicopters begin shuttling supplies from the USS Princeton. |
| 21 | Opn THANG LONG 27, Dinh Tuong Sector, wrests Ba Dua from VC control, kills 136 VC. |
| 22 | Opn PHONG HOAI, Tay Ninh Sector, concludes with destruction of a VC base area and arms factory, 157 VC killed. |
| December 1964 |
| 5 | Gen Ky gives ultimatum to Gen Khanh - support Prime Minister Huong or else; VNAF 100% alert. |
| 6 | Opn DAN CHI 92, IV Corps, 138 VC killed. |
| 7 | VC overrun battalion command post on hill 193, threatens An Lao Subsector hqs, stay in area to fight. Two companies of ARVN missing. |
| 9 | RVN forces retake hill 193, and secure An Lao Subsector hqs. |
| 9 | VC attack 3d Regt hqs and arty position in Quang Tin Sector: RVN reaction forces kill 162 VC. |
| 20 | Bloodless coup; High National Council dissolved. |
| 25 | Brink BOQ bombed; 2 (US) killed, 108 (US and VN) wounded. |
| 28 | RVN reaction force runs into 2-4 hard core VC bns in Ba Xuyen Sector, kill 87 VC, make largest capture of enemy weapons to date, including two 75mm recoilless-rifles and four 50.cal. anti-aircraft machine guns. |