From The March of Folly (Barbara Tuchman, 1984) pp276
… At the same time, in February 1955, the decision to undertake the training of a “completely autonomous” Vietnamese army was taken, and with it a deep step into Vietnamese affairs.
The assumption of American responsibility had already brought with it the creeping companion of all interventions, covert operations. A combat team calling itself the Saigon Military Mission had begun operating in North Vietnam under the direction of General O’Daniel and the command of Colonel Lansdale, an officer of the Air Force and later of the CIA who had led activities against the Huk guerrillas in the Philippines. Conceived and organized before the Geneva Agreement, its operations were conducted for a year after the Geneva provisions made them illegitimate. The Mission’s original assignment was to “undertake paramilitary operations against the enemy” – although technically speaking the United States as a non-belligerent had no “enemy.” Its purpose was modified after Geneva to read “prepare the means” for such operations. To that end the Lansdale Mission engaged in the sabotage of trucks and railroads, undertook the recruiting, training and infiltrating of two covert South Vietnamese “paramilitary” teams, and planted for their use caches of smuggled supplies, arms and ammunition. Since the Geneva Agreement had prohibited the introduction of all war materiel and personnel after 23 July 1954., and the United States had pledged not to “disturb” these provisions, the. Mission after that date violated the pledge. While not very heinous per se and normal enough if the nation had been at war, the violation began the series of falsehoods that were to widen until they engulfed the reputation and damaged the self-respect of the United States.