The COMSEC Custodian/Special Device Inventory Manager performs receipt, temporary storage, and transfer services for U.S. DoD - provided single or two-person special access control devices, COMSEC equipment, FMS customer host nation provided COMSEC equipment, documents, keying, and other materials; train FMS host nation personnel in the proper custodianship, safeguarding, and operation of DoD-provided special devices, COMSEC equipment, and materials, including keying materials; and conduct periodic inventories and inspections of DoD-provided special devices, COMSEC equipment, documents, and materials, including keying materials. Provides training and technical support, including COMSEC Responsible Officer training, to OCONUS host country personnel in the proper custodianship, safeguarding, and operation of DoD-provided special inventory, COMSEC equipment, keying, and other materials to include installation of equipment, loading and zeroing equipment, trouble-shooting (when necessary), and emergency destruction procedures to satisfy requirements for secure interoperability whenever there are new personnel, equipment, policy, or procedures on-board that requires it.