| Encyclopedia Astronautica |
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To provide the Gemini spacecraft with a rendezvous and docking target, Agena D rocket stages were modified with the addition of a docking collar, status panel display, and restart capabilities for the Gemini program. After docking, the Agena had sufficient fuel reserves to boost the Gemini into high earth orbits, to the edge of the radiation belts. References: 26 , 40 , 205 .