DoD has implemented Directive 8570, which provides guidance and procedures for the training, certification and management of all government employees who conduct information assurance functions in assigned duty positions. These individuals are required to carry an approved certification for their particular job classification. Currently, the DoD information assurance (IA) workforce is divided into two categories: Information Assurance Management (IAM) and information Assurance Technical (IAT) Each of the two has three levels (I, II and III) depending on experience, knowledge and job scope.”]
Source: https://www.bankinfosecurity.com/dod-to-prospective-employees-certification-required-a-1604