[2] After World War II, the Military Police Command was activated in lieu of the Philippine Constabulary.

A Criminal Laboratory was made by the division to support constabulary units with background in scientific criminology.

14 which resulted to the reorganization of the defunct Philippine Constabulary into two main components, a general staff unit, called the Intelligence Division or C2, and an operating special staff unit, the Criminal Investigation Service (CIS).

[2] On October 28, 1955, a Police Intelligence Branch was created by the CIS and in 1958 the investigation body was elevated to a division.

The main protagonist, some antagonists and some supporting casts of this series are playing as police officers of the group.