This document provides an overview of gSNAP, Sun Microsystems' Secure Network Access Platform reference architecture for secure collaboration in government customers. It describes gSNAP as a "70% solution" that leverages Sun's trusted computing environment, ultra-thin client technology, and partner products for secure access across multiple network security domains from a single desktop. Use cases are presented for gSNAP deployments in defense, public safety, and health agencies to enable secure collaboration within and between organizations. Requirements for trusted computing, secure inter-domain data transfer, and remote access are outlined. The document positions gSNAP against market drivers in government for increased cross-agency collaboration and mobility requirements.