It is a play on the official motto Semper Fidelis, usually abbreviated Semper Fi, which means "Always Faithful", and that of the US Coast Guard, Semper Paratus, meaning "Always Ready." Semper Gumby, referring to the cartoon character Gumby, means "Always Flexible."
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The phrase was also said by Corporal Gabriel 'Gabe' Garza played by Rey Valentin on the HBO series Generation Kill.
Gumby | Gottfried Semper | Semper Floreat | Semper's organ | Semper Fidelis | Semper fidelis | Semper | Nina Baden-Semper | L.S. Alexander Gumby | Gumby: The Movie | Ea Semper | Carl Semper |