I bought "Remove Before Flight" tags on eBay in 2010—it turns out they're from Challenger https://arstechni.ca #MichoudAssemblyFacility #RemoveBeforeFlight #Spaceexploration #spacememorabilia #40thanniversary #LockheedMartin #spaceartifacts #externaltank #spacehistory #Spaceshuttle #Challenger…
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