 Complete the following phrase:  The period that Obregón had been elected to serve, between 1928 and 1934, was when Calles became the Jefe Máximo, the maximum chief, and the power behind the presidency. It was a title he never used for himself. The period is known as the Maximato 19281934, with many regarding Emilio Portes Gil, Pascual Ortiz Rubio, and Abelardo Rodríguez as puppets of Calles. Officially, after 1929, Calles served as minister of war, as he continued to suppress the 