Intrepid, an SPA Company | 11,713 followers on LinkedIn. Intrepid is now an Systems Planning & Analysis Company. | Intrepid, an SPA Company, is a Huntsville, Alabama based small business provider of services and technologies in the Federal marketplace. We have supported the Department of Defense (DoD), including the Missile Defense Agency (MDA) and the U.S. Army, with distinction since 2002.