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| Two Gemini 6 covers featuring the official NASA cachet, postmarked with a Kennedy Space Center machine cancel on October 25, 1965. The mission was cancelled due to a technical failure during the launch of the Agena rocket. |
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| Photo: Thomas Stafford adjusting Walter Schirra's space suit during training on October 23, 1965. |
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| Photo: The interior of the Gemini 6 spacecraft. |
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| Photo: An illustration of a series of Gemini 6 and Agena docking maneuvers. |
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| Photo: The Agena rocket for Gemini 6 to rendezvous in space, exploded in the sky shortly after launch. |
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| Gemini 6 cover from "Astro Covers," postmarked at Cape Canaveral on October 25, 1965. |
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| A Gemini 6 cover with a "PM" postmark at Cape Canaveral on October 25, 1965. |
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| Photo: Backup pilots of Gemini 6, Gus Grissom and John Young, wear "out of service" card on their suit, after the Agena rocket failed to launch. |
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| The USS Wasp was the designated recovery ship for the Gemini 6 mission, which was scrubbed on October 25, 1965. The cover above features the USS Wasp ship's cachet and a hand cancel dated October 25, 1965. |
