In late 1950, in the wake of China's entrance into the war and the retreat of allied forces, now-Captain Vann was given his first command, a Ranger company, the Eighth Army Ranger Company. He led the unit on reconnaissance missions behind enemy lines for three months, before a serious illness in one of his children resulted in his transfer back to the United States. While assigned to Rutgers University's ROTC program as an assistant professor of military science and tactics, he received a B.S. with a concentration in economics and statistics in 1954.