Guevarism is a theory of communist revolution and a military strategy of guerrilla warfare associated with Argentinian Marxist Che Guevara. Guevara, one of the leaders of the Cuban Revolution, believed in the foco theory, which promoted exporting the revolution to any country supported by an imperialist nation (specifically the United States), claiming that popular forces will always defeat the government due to their advantage in a non-urban setting. He believed in vanguardism by small "commando" units instead of by parties, and he was inspired by Maoism's "protracted guerrilla war" theory and the NLF's strategy during the Vietnam War.