In Project Gemini, the Titan II GLV space rocket used as fuel hydrazine and nitrogen tetroxide, so safety concerns over its toxic propellants were present. But along with the special care that was needed due to its toxic fuel, something else that should guarantee safety was the launch escape system.
Usually there are two types of escape systems:
-First, the capsule abort system with rockets mounted on a tower above the capsule. (Dragon V2 uses a different concept, but still the role is to “push” the capsule away from the rocket.)
-Second, ejection seats as used in military aircraft: each crewmember returns to Earth with an individual parachute. But such systems are effective in a limited range of altitudes and speeds.
In human spaceflight programs, a possible failure would mean crew loss and a possible termination of the program or, in the best case, postponing it for years until everything would be 100% safe. But Project Gemini was like a stepping stone for the manned moon program. Time was very important because it was a space race in those years, and to achieve the goals, everything should be successful, at the right time, and safe. Of course, taking the risk could lead to success, but why did NASA choose that kind of technology, the ejection seat, instead of a system with rockets mounted on a tower above the capsule, which was tested previously in Project Mercury and used in later capsules like Apollo and Soyuz. The tower escaping system is used even in this days in Soyuz spacecraft and will be used in the future missions of Orion spacecraft. Since the ejection seat system is effective and safer in a limited range of altitudes and speeds, the risk is higher by using this system because the failure of the rocket could happen at any time in different altitudes and speeds. The tower escape system had been developed and tested as a technology before Project Gemini, why wasn’t it chosen?