vigilantes and army units killed actual and alleged PKI members. Although killings occurred across Indonesia, the worst were in the PKI strongholds of Central Java, East Java, Bali, and northern Sumatra. It is possible that over one million people were imprisoned at one time or another. Sukarno's balancing act of "Nasakom" (nationalism, religion and communism) had been unravelled. His most significant pillar of support, the PKI, had been effectively eliminated by the other two pillars—the army and political Islam; and the army was on the way to unchallenged power. In March 1968, Suharto was formally elected president. The killings are skipped over in most Indonesian history books and have received little introspection by Indonesians and comparatively little international attention. Satisfactory explanations for the scale and frenzy of the violence have challenged scholars from all ideological perspectives. The possibility of a return to similar upheavals is cited as a factor in the "New Order" administration's political conservatism and tight control of the political system. Vigilance against a perceived communist threat remained a hallmark of Suharto's thirty-year presidency. The CIA described the massacre as "one of the worst mass murders of the 20th century, along with the Soviet purges of the 1930s, the Nazi mass murders during the Second World War, and the Maoist bloodbath of the early 1950s." Later army operations have not been without controversy however. Involvement in UN Peacekeeping operations continued, but in 2010, the United Nations Interim Force in Lebanon was strongly criticized after two soldiers from Indonesia were filmed fleeing a clash on the Israeli-Lebanon border in a taxi. The size of the Army has expanded over the years; in July 1976 the Army was estimated to consist of solely 180,000 personnel, one armoured cavalry brigade, part of Kostrad (one tank battalion, plus support units), 14 infantry brigades (90 infantry, 1 para, 9 artillery, 11 anti-aircraft, and 9 engineer battalions) of which three of the brigades were in Kostrad, two airborne brigades totalling six battalions, also part of Kostrad, one independent tank battalion, 7 independent armoured cavalry battalions, and four independent para-commando battalions. Organisation The Indonesian Army is currently organized into 15 military regions which are spread throughout the Indonesian archipelago. They are placed under the jurisdiction of the army headquarters. Three are based in Sumatra, four are based in Java, two are based in Kalimantan, one based in Lesser Sunda Islands, two based in Sulawesi, one