Rodríguez Díaz attended the military school, where he graduated as infantry second lieutenant, and then was assigned to the Presidential Army Staff of Manuel Estrada Cabrera.

Along with Miguel García Granados Solís, Óscar Morales López and Ricardo "Chato" Rodas were the aviation pioneers in Guatemala when they collected funds to buy the first airplane in the country, which they christened with the name "Central America".

[b][1] In 1929, Guatemalan military aviators – led by Colonel Miguel García Granados Solís – had been able to set up a modest airline service in the country using three Ryan Brougham B-5 single engine planes that they used to transport mail and cargo to the farthest posts in Guatemala.

[2] Colonel Rodríguez Díaz died on 28 September 1929, in a tragic accident known as "Dolores Street air crash"', along with lawyer José Luis Balcárcel (member of the Generation of 1920 intellectuals and classmate of future Literature Nobel Prize awardee Miguel Ángel Asturias, among others), the child Carlos Montano Novella and engineer Julio Montano Novella, Guatemalan Consul in New York City.

[1] Rodríguez Díaz's tomb was designed and built by Guatemalan sculptor Rafael Yela Günther and is in the Guatemala City General Cemetery.