Eisenhower built a Cuban refugee army, and a Tibetan refugee army. Kennedy abandoned both to their fates. The Tibetans were wiped out to a man. The Cubans were dropped off onto a beach with Castro waiting for them.
If you were one of the men tasked to train these men and prepare them for combat, you’d probably be pretty steamed.
Not to mention that the entire fiasco depended entirely on Castro being assassinated before the op actually began.