The Invisible Sword

National Archives and Records Administration - ARC Identifier 4525053 / Local Identifier 330-DVIC-709472 - The Invisible Sword - Department of Defense. Office of the Secretary of Defense. (09/18/1947 - ). Audience: All Service Attendees At Non-Commissioned Officer Academies Or Officer Career Courses. Synopsis: Provides soldiers with psychological operations (PSYOP) terminology and developments and shows how PSYOP is used as both an offensive and defensive tool. PSYOP coordination requirements and the integration process for including PSYOP into military operations is also included. -