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when, short of the dissolution of the country, has a government agency ever dissolved?

I don't know, I dare say that perhaps some state or local agencies have closed their doors. They don't really have to close, they can be merged or reduced is size it scope as happens fairly frequently.

Never happened to my knowledge. There is still a HELIUM agency which provides Helium for Dirgibles used in the war...which war? WWI...the need has gone..the agency remains.
Do you want to talk about Mohair? (used in WWII uniforms?)