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The Interagency OPSEC Support Staff (IOSS) provides operations security (OPSEC) training, program development assistance, and awareness materials in support of the National OPSEC Program. OPSEC is a systematic and proven process used to deny adversaries information about U.S. capabilities and intentions by protecting unclassified information about sensitive activities. The OPSEC process involves five steps: identification of critical information, analysis of threats, analysis of vulnerabilities, assessment of risks, and application of appropriate countermeasures. The IOSS' mission is to promote OPSEC principles and help members of the national security community develop their own self-sufficient OPSEC programs to better protect U.S. programs and activities.