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Here's a good view of several of the rockets -- from left to right, Mercury, Gemini/Atlas, Agena.
The Atlas/Agena launch vehicle was used during the Gemini program in the mid-1960s to launch the Agena docking module/upper stage into orbit.
This is the business view of the RS-24 Space Shuttle Main Engine exhaust. Capable of 400,000lbs of thrust, the Shuttle has three of these on board.