The National Safeman's Organization (NSO) is one of North America's largest trade associations of safe and vault technicians.
It provides technical training in safe-cracking at periodic "Penetration Parties" and offers three levels of certification: The organization was formed in the fall of 1992 between National Publishing and safe expert Dave McOmie.
[2] Registered Safe Technician (RST) is a qualification awarded to members of the National Safeman's Organization who have passed the required test.
The written sections concentrate on testing the candidates' research and safe identification skills.
The CMS accreditation has been available to safe technicians since 1997, and is proctored by the National Safeman's Organization.