The Special Activities Division (SAD), known as the Special Activities Center (SAC) from 2015, is the covert operations wing of the United States Central Intelligence Agency (CIA). The SAD was the spiritual successor of the World War II-era OSS, which trained and equipped resistance movements behind Axis lines, and it is responsible for clandestine or covert operations that rely on plausible deniability. The group generally recruits special forces personnel as paramilitary personnel. During the Cold War, CIA paramilitary teams supported the Tibetan resistance in China, conducted unconventional warfare in North Korea during the Korean War, supported the Bay of Pigs invasion, trained the Bolivian Army against Che Guevara's National Liberation Army of Bolivia, took part in the Phoenix Program during the Vietnam War, helped train and lead Nicaraguan Contras against the Sandinistas, interrogated prisoners during the Salvadoran Civil War, worked with JSOC to track high-value targets during the Somali Civil War, trained Mujahideen during the Soviet-Afghan War, fought alongside the Northern Alliance in the invasion of Afghanistan, targeted al-Qaeda operatives in Yemen, helped Kurdish Peshmerga forces battle Ansar al-Islam during the invasion of Iraq, battled the Islamic State during the Iraqi Civil War, coordinated UAV strikes during the War in North-West Pakistan, and trained moderate Syrian rebels during the Syrian Civil War.