Special Security Office/Special Intelligence Communications (SPINTCOMM) Branch (IOS) executes HQMC responsibilities concerning management of the Marine Corps Special Security Office (SSO), the Defense Special Security Communications System/Special Intelligence Communications (DSSCS/SPINTCOMM) terminal facility; install, administer and troubleshoot HQMC Sensitive Compartmented Information (SCI) Local Area Network (LAN); and provide SCI courier service for HQMC.