Eventually, four CAT pilots were trained on US Air Force H-19A helicopters in Japan and the Philippines. The CAT contingent did not reach Laos until March 1960. Due to the operating limitations of the H-19s, the underpowered helicopters could fly only at lower elevations in the country. "Generally, they were used to carry CIA case officers to meetings in outlying areas and to distribute leaflets during elections. By June 1960, it had become clear that helicopters would form a permanent part of Air America's operations in Laos. "
Air America hired four experienced US Marine Corps helicopter pilots who obtained their discharges in Okinawa to fly the H-19s. Later in the year, the CIA arranged for the Marine Corps to transfer four UH-34 helicopters to Air America to replace the H-19s.
Also in 1960 was a national election of questionable honesty. "Phoumi's group gained a sweeping majority. On the surface, a relatively tough U.S. policy of containing Communism seemed to be an overwhelming success... $250 million in U.S. economic and military aid had too heady an effect on the Laotian government, which was soon reeling with corruption. Promised reforms never materialized, and practically no funds reached the peasants and forest tribes. The Communist Pathet Lao guerrilla bands began raiding in the north. Red Prince Souphanouvong not only walked out of jail, but took most of his prison guards with him."
In August 1960, Kong Le, who had formed a friendship with a CIA officer in 1958, still returned neutralist Souvanna Phouma to power with a military coup. Phoumi Nosavan, who had much closer CIA relations, took refuge in his base in Savannakhet, in southern Laos.
The US encouraged Phoumi Nosavan, in December, to attack Kong Le's battalion in Vientiane.
Kong Le retreated to the strategic Plaine des Jarres, joining forces with the Pathet Lao. The Soviet Union poured in supplies by air, and Communist North Viet Nam contributed tough guerrilla cadres. When Phoumi's army advanced, it was badly beaten in a series of noisy but largely bloodless battles. Phoumi got a breathing space when, in the spring of 1961, the government eagerly agreed to a ceasefire.
Read more about this topic: CIA Activities In Laos