Caliber 3 was founded in 2007 by Colonel Sharon Gat (Res.) of the Israel Defense Forces (IDF). It has since risen to prominence as the foremost academy for Counter-Terrorism, Security, and Defense training not only in Israel but also on a global scale. Presently, Caliber-3, under the stewardship of active IDF service members, extends its cutting-edge educational and training offerings worldwide. These encompass expertise in Counter-Terrorism, Security, and Defense as well as High-Threat Protection, Intelligence Operations, and Tactical Combat. These services cater to military, law enforcement agencies, government entities, and commercial clients.

Customers include:
- Units of the Israel Defense Forces (IDF)
- The Office of the Prime Minister of Israel
- The Israeli Government's Office of Security
- The Israeli Police
- The Israeli Government's Office of Internal Security
- The Israeli Government's Foreign Office
- The Israeli Government's Office of Education
- The City of Jerusalem
- The City of Jerusalem's Office of Light Rail Transportation
- The Bank of Israel