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1: Command Module Lab
2: Command Service Unit
3: Shell
4: Airlock
5: Base mount
6: Science units
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One of the more weird proposals of the Apollo Applications Program (AAP) was an Apollo-based manned Mars mission!
The unit is driven by a chemical reaction drive (3) flanked by two S II nuclear booster units (4, 5). It includes a MEM (Mars Excursion Module, 1), an EEM (Earth Entry Module, 6) and a huge main cabin (2) that constitute the manned unit (8), also containing a launch engine for the ascent from Mars (3) and propulsion tanks (7).
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2: Command module
3: Service module
4: Adapter (LEM casing)
5: Sleeping, hygiene and medical unit
6: Radiation-proof cabin and control centre (for four days isolated stay)
7: Centrifuge for artificial gravity and spare parts storage used as a counterweight
8: Cable rolls, control devices and drives
9: Connector to the service unit
Illustrations by Bernhard Borchert
Source: A. F. Marfeld, "Astronautik", Safari-Verlag 1969