[2] While as a colonel and deputy chief of Western Police District,[3] he was tasked to guard the Mendiola Street in 1987, where the agrarian militants protesting against the administration of Corazon Aquino.

[3] He served as the chief of its Central Luzon unit, Regional Command 3 (RECOM 3), in 1989 while coup against President Aquino was prevalent.

Later, after General Ramon Montaño retired, Nazareno became the Chief of the Philippine Constabulary.

[4] When the military constabulary replaced by the civilianized Philippine National Police, Nazareno was retained and became its inaugural chief in 1991 and served until August 1992.

[5] Nazareno have corruption charges involving ghost purchases of combat uniforms and equipment worth P38.2 million.