Who is primarily responsible for the withdrawal and decommissioning of and information system? Response:

A Security Architect designs and builds security into systems, but is not primarily responsible for the overall lifecycle management and decommissioning decisions.

A Senior Information System Security Officer (ISSO) advises on and oversees the security posture of systems, but the ultimate ownership and decommissioning responsibility lies with the system owner.

An Information System Security Engineer implements and maintains security controls, focusing on the technical aspects of security, not the primary responsibility for system withdrawal.

The Information System Owner is the individual responsible for the procurement, development, integration, modification, operation, maintenance, and ultimate disposition (withdrawal and decommissioning) of an information system. This role carries the primary accountability for the system's lifecycle and its associated resources.