ubans in Guatemala. He also provided airstrips in the region of Petén for what later became the failed Bay of Pigs Invasion in 1961. Ydigoras' government was ousted in 1963 when the Guatemalan Air Force attacked several military bases. The coup was led by his Defense Minister, Colonel Enrique Peralta Azurdia.
In 1966, Julio César Méndez Montenegro was elected president of Guatemala under the banner "Democratic Opening". Mendez Montenegro was the candidate of the Revolutionary Party, a center-left party which had its origins in the post-Ubico era. It was during this time that rightist paramilitary organizations, such as the "White Hand" (Mano Blanca), and the Anticommunist Secret Army, (Ejército Secreto Anticomunista), were formed. Those organizations were the forerunners of the infamous "Death Squads". Military advisers from the United States Army Special Forces (Green Berets) were sent to Guatemala to train troops and help transform its army into a modern counter-insurgency force, which eventually made it the most sophisticated in Central America.
In 1970, Colonel Carlos Manuel Arana Osorio was elected president. A new guerrilla movement entered the country from Mexico, into the Western Highlands in 1972. In the disputed election of 1974, General Kjell Laugerud García defeated General Efraín Ríos Montt, a candidate of the Christian Democratic Party, who claimed that he had been cheated out of a victory through fraud. On February 4, 1976, a major earthquake destroyed several cities and caused more than 25,000 deaths. In 1978, in a fraudulent election, General Romeo Lucas García assumed power.
The 1970s saw the birth of two new guerrilla organizations, The Guerrilla Army of the Poor (EGP) and the Organization of the People in Arms (ORPA), who began and intensified by the end of the seventies, guerrilla attacks that included urban and rural guerrilla warfare, mainly against the military and some of the civilian supporters of the army. In
