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12/31/2007. The first two-seat F-15B was selected for modification as the STOL/MTD (Short Take-Off and Landing/Maneuvering Technology Demonstrator) experimental aircraft. The STOL/MTD program was known as Agile Eagle. The aircraft was fitted with movable canards, a strengthened undercarriage for rough field landings, and received upgraded and enhanced equipment. Designated NF-15B the modified aircraft was flown for the first time by Larry Walker on September 7, 1988. Early 1989 the engine nozzles were replaced by rectangular thrust-vectoring, thrust-reversing nozzles, and it was flown in this configuration on May 16, 1989, the nozzles were tested in flight for the first time on March 23, 1990. The aircraft has been transferred to the NASA, coded 837, being registered as N837NA on July 23, 2001.