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| A GT-9 launch cover from "Centennial", postmarked at Cape Canaveral (AM time slug) with a hand cancel on June 1, 1966. The attempt was scrubbed because of a malfunction in the Atlas/ATDA launch sequence. |
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| Photo: Eugene Cernan and Thomas Stafford moved away from their Titan rocket at Cape Kennedy after the Gemini 9 mission was postponed because of last-minute equipment problems. |
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| A GT-9 launch cover featuring a "GT-9 Launch Postponed" stamped cachet, postmarked at Cape Canaveral (PM time slug) with a hand cancel on June 1, 1966. |
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| A GT-9 launch cover from "Sarzin", postmarked at Patrick Air Force Base with a machine postmark on June 1, 1966. |
