What are four major events of the Vietnam war under President Johnson?

The Gulf of Tonkin Resolution on 7 August 1964.

The beginning of Operation Rolling Thunder in February of 1965.

The Marine Landing at DaNang of two Marine Infantry Battalions on 8 March 1965.

The US begining the bombing of Haiphong on 29 January 1966.

The deceision by the President not to seek re-election on 31 March 1968.