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“The main trouble with the Mercury capsule was that most system components were in the pilot’s cabin; and often, to pack them in this very confined space, they had to be stacked like a layer cake and components of one system had to be scattered about the craft to use all available space. This arrangement generated a maze of interconnecting wires, tubing, and mechanical linkages. To replace one malfunctioning system, other systems had to be disturbed; and then, after the trouble had been corrected, the systems that had been disturbed as well as the malfunctioning system had to be checked out again.” James Chamberlin
![Proposed Lunar Lander](https://i0.wp.com/www.spacerockethistory.com/wp-content/uploads/2014/01/fig8-proposed-lunar-lander-to-be-used-with-an-advanced-version-of-the-Mercury-spacecraft.jpg?resize=150%2C150&ssl=1)
Proposed Lunar Lander
![Modified Titan II Booster](https://i0.wp.com/www.spacerockethistory.com/wp-content/uploads/2014/01/The-modified-Titan-II-booster-that-was-to-launch-the-advanced-Mercury-spacecraft.jpg?resize=150%2C150&ssl=1)
Modified Titan II Booster
![Adapter Section of Mark II](https://i0.wp.com/www.spacerockethistory.com/wp-content/uploads/2014/01/The-adapter-section-of-McDonnells-proposed-two-man-Mercury-spacecraft.jpg?resize=150%2C150&ssl=1)
Adapter Section of Mark II
![Ejection Seats](https://i0.wp.com/www.spacerockethistory.com/wp-content/uploads/2014/01/An-artists-version-of-the-use-of-ejection-seats-to-escape-from-the-Gemini-spacecraft.jpg?resize=150%2C150&ssl=1)
Ejection Seats
![Fuel Cell](https://i0.wp.com/www.spacerockethistory.com/wp-content/uploads/2014/01/The-operating-principle-of-the-fuel-cell-designed-by-General-Electric-adopted-for-use-in-the-Gemini-spacecraft.jpg?resize=150%2C150&ssl=1)
Fuel Cell
![Rendezvous](https://i0.wp.com/www.spacerockethistory.com/wp-content/uploads/2014/01/Four-stages-in-a-rendezvous-mission-as-conceived-early-in-1962.jpg?resize=150%2C150&ssl=1)
Rendezvous