In August 1966 — three years before Neil Armstrong stepped onto the Moon — Philco-Ford delivered a 600-page final report to NASA's Marshall Space Flight Center titled "Mars Excursion Module Study." It was a complete engineering design for a vehicle to land humans on Mars and return them to orbit. The contract number was NAS8-20262. The first crewed landing was scheduled for November 1981.
The MEM was the lander half of NASA's EMPIRE (Early Manned Planetary-Interplanetary Roundtrip Expeditions) and follow-on UMPIRE studies, which proposed using a Saturn V derivative and NERVA nuclear-thermal upper stage to push a 6-crew vehicle to Mars on a roughly 640-day conjunction-class trajectory. Wernher von Braun personally championed the architecture in his August 1969 memo to Vice President Agnew, two weeks after Apollo 11 splashed down. He proposed twin nuclear-powered ships departing Earth orbit in November 1981.
The MEM itself was a marvel:
- Biconic lifting-body aeroshell, 30 feet across at the base — the same general shape SpaceX is now using on Starship's nose
- Mass at Mars arrival: ~44,000 lb, with a crew of three descending while three orbited (Apollo architecture, scaled up)
- Surface stay: 10 to 40 days
- Ascent stage burned FLOX (fluorine-oxygen) / methane — yes, methane, sixty years before Starship
- Powered by a SNAP-8 radioisotope generator for surface power
- Hypersonic entry from Mach 27 using a 70-degree blunt cone, decelerating to subsonic at ~20,000 ft for a tail-first powered landing
Why did it die? Three reasons, all political, none technical:
- Nixon's 1970 budget gutted post-Apollo planning. NERVA was cancelled in 1972 despite passing all ground tests (the NRX-A6 ran at full power for 62 minutes). Without nuclear-thermal propulsion, the mass budget for Mars collapsed.
- Vietnam. NASA's budget fell from 4.4% of federal spending in 1966 to 1% by 1975.
- The Shuttle decision. NASA traded deep-space capability for a low-Earth-orbit truck that ended up costing more per flight than a Saturn V.
Why it's viable now: Every technical obstacle Philco-Ford flagged in 1966 has been solved or is being solved:
- Methane propulsion is now flight-proven (Raptor, BE-4)
- Hypersonic biconic entry has been validated by Mars Science Laboratory and Perseverance — the MSL aeroshell is geometrically close to the MEM's
- NERVA's successor, DRACO (DARPA/NASA, contracted to Lockheed/BWXT in 2023), is targeting a 2027 in-space demonstration of a nuclear-thermal stage with nearly twice the specific impulse of chemical engines — exactly the capability that died with NERVA
- Closed-loop life support has been continuously operated on ISS for 25 years
- Lifting-body precision landing at Mars density was demonstrated by Perseverance's Sky Crane in 2021
The MEM wasn't science fiction. It had a part number, a contractor, a launch date, and a crew size. NASA didn't fail to design a Mars lander. NASA designed one — and then watched the political wind change and put the binders on a shelf at Marshall, where the original Philco-Ford volumes still sit in the archive.
