In August 1971, President Richard Nixon even proposed to cancel all remaining lunar landings (Apollo 16 and 17). His Office of Management and Budget Deputy Director Caspar Weinberger was opposed to this, persuading Nixon to keep the remaining Moon missions, but recommended that if such cancellation would happen that it be "on the ground that Apollo 15 was so successful in gathering needed data that we can now shift, sooner than previously expected, to the Space Shuttle, Grand Tour, NERVA, etc."