The Lunar Landing Training Vehicle (LLTV) was developed for NASA by Bell Aerosystems, Inc. The LLTV was used by NASA Apollo Program astronauts to develop piloting skills. The LLTV provided Apollo program commanders the opportunity to experience the flight characteristics associated with the 1/6th gravity conditions on the moon. The first LLTV vehicle was assembled at Ellington Air force Base in Houston, Texas in 1967. This is most likely the first LLTV.