The Computer & Information Security Specialist 2/3 position at Los Alamos National Laboratory involves working within the Chief Information Security Office (CISO) - Cyber Security group. The role focuses on security compliance and accreditation related to enterprise networks and IT systems, with responsibilities including managing security plans, implementing TEMPEST countermeasures, and collaborating with various security programs. The position can be filled at two levels, with the higher level requiring more advanced expertise and mentorship responsibilities.