[2] He entered the Salvadoran Escuela Militar Capitán General Gerardo Barrios in 1955 and graduated in 1958 with the rank of junior lieutenant of the infantry.

Colonel Majano resigned as Commander-in-Chief and Chairman of the Revolutionary Government Junta in May 1980 and was replaced with Jaime Abdul Gutiérrez.

[2][5][6] On the evening of 15 December, he convened a press conference at which he accused the junta of terrorism and the Christian Democratic Party of conciliation.

The junta issued an order for the arrest of Majano, which immediately provoked a protest from the leaders of the Military Youth.

The press often reported Majano's intention to join the Farabundo Martí National Liberation Front following his arrest warrant being issued.