Nguyễn Khánh
Day two of Sigma II-64 was deemed to be 15 April 1965, although in reality it was 14 September 1964. This day's war game began with Blue intensifying its aerial campaign on North Vietnam, mining Haiphong harbor, bombing airfields at Haiphong and Phúc Yên, smashing bridges, and demolishing the North's only machine tool plant and its concrete factories. Red infiltration of South Vietnam continued unchecked. McGeorge Bundy's simulation participation was disrupted by an actual coup being attempted against General Nguyễn Khánh in real life.