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| 1964 | General |  |
| Appointed Commander of USAMilitary Assistance Command in Vietnam |
| 1965 | Arc Lght | |
| Dec Arc Light sorties hit Laos |
| 1965 | Arc Light | |
| B52s are deployed for bombing in tth Vietnam against battle targets & Viet Cong bases |
| 18th June Ben Cat Operation Light I, bombing of Ben Cat Special Zone Viet Cong base, a limited success |
| Nov 82 B-52Ds are modified to carry 42 750-pound bombs |
| 15th Nov La Drang Valley B-52s support USAground forces for the 1st time |
| 1965 | Battle of Drang | |
| Drang USAvictory in west-central Vietnam near the Cambodian border |
| 1965 | Bombing of Laos | |
| Dec Arc Light sorties hit Laos |
| 1965 | Bombing of Vietnam | |
| 20th April Honolulu McNamara & Westmorland agree to use B52s for conventional bombing in Sth Vietnam |
| 1965 | Mobilization | |
| 20th April Honolulu McNamara, Westmoreland, Wheeler, William Bundy & Ambassador Taylor recommend to the President sending another 40,000 combat soldiers |
| 23rd Nov Cables Washington requesting 200,000 more troops in 1966 |
| 1965 | Siege of Da Nang | |
| 22nd Feb Da Nang General Westmoreland requests 2 battalions of USAMarines to protect the American air base at Da Nang from 6000 Vietcong |
| 8th Mar Da Nang The 1st USAcombat troops arrive in Vietnam as 3500 Marines land at China Beach to defend the American air base at Da Nang |
| 1965 | Siege of Drang | |
| Drang Highlights greater than expected North Vietnamese penetration into Sth Vietnam |
| 1966 | Arc Light | |
| Mar Bien Hoa The 1st of 7 radar sites is established at Bien Hoa air base |
| 1st July Combat Skyspot allows 3rd Air Div to place B-52s as a quick reaction force |
| Nov McNamara agrees to Westmorland's request for 600 sorties per month, achieved in Nov |
| 1966 | Bombing of Mu Gia Pass | |
| 11th April Mu Gia Pass B-52s bomg the Mu Gia Pass on the Ho Chi Minh Trail in Laos |
| 27th April Mu Gia Pass B-52s bomg the Mu Gia Pass on the Ho Chi Minh Trail in Laos |
| 1966 | Bombing of Nth Vietnam | |
| B-52s strike Nth Vietnam for the 1st time |
| 1966 | Landing Quangngai Province | |
| Quangngai The USAlaunches the largest amphibious operation since Inchon to land more troops |
| 1967 | Mobilization | |
| 18th Mar Requests 200,000 troops, rising to 670,000 |
| 18th Mar Urges expansion of ground operations in Laos & Cambodia |
| 1968 | Arc Lght | |
| 1st Feb McNamara approves a sortie rate of 1,200 effective from 1st Feb |
| 1968 | General | |
| Appointed Chief-of-Staff for the USAArmy |
| Appointed Chief-of-Staff of the Army |
| 1968 | Light Arc | |
| Feb The monthly sortie rate is increased to 1,800 |
| 1968 | Niagra | |
| 21st Jan Kheh Orders Operation Niagra after the Viet Cong strke Khe Sanh |
