Lockheed Martin's [LMT] fifth space-based infrared system (SBIRS) missile warning satellite is in qualification testing, as the company has completed a preliminary design review (PDR) on the follow-on to SBIRS--the next-generation overhead persistent infrared (OPIR) Block O GEO satellites, a company official said on Nov. 10. "SBIRS 5 is finishing up real soon," Rick Ambrose, executive vice president of Lockheed Martin Space, told reporters. "It's been through a good chunk of its qualification testing." "The team is running fast and…