Operation Momentum was a guerrilla training program during the Laotian Civil War. This Central Intelligence Agency operation raising a guerrilla force of Hmong hill-tribesmen in northeastern Laos was planned by James William Lair and carried out by the Thai Police Aerial Reinforcement Unit. Begun on 17 January 1961, the three-day Auto Defense Choc course graduated a clandestine guerrilla army of 5,000 warriors by 1 May, and of 9,000 by August. It scored its first success the day after the first ADC company graduated, on 21 January 1961, when 20 ADC troopers ambushed and killed 15 Pathet Lao.

James William Lair was an influential Central Intelligence Agency paramilitary officer from the Special Activities Division. He was a native Texan, raised in a broken family, but a good student. He joined the CIA after serving in a combat unit in Europe during World War II, followed by a geology degree from Texas A&M. In his senior year, he was recruited by the CIA.