In the Midst of Wars: An American's Mission to Southeast Asia

Edward Geary Lansdale (1908 – 1987) was a United States Air Force officer until retiring in 1963 as a major general before continuing his work with the Central Intelligence Agency (CIA). Lansdale was a pioneer in clandestine operations and
psychological warfare. In the early 1950s, Lansdale played a
significant role in suppressing the Hukbalahap Rebellion in the Philippines. In 1954, he moved to Saigon and started the Saigon
Military Mission, a covert intelligence operation which was created to
sow dissension in North Vietnam.
Lansdale believed the United States could win guerrilla wars by
studying the enemy's psychology, an approach that won the approval of
the presidential administrations of both Kennedy and Johnson.