Semper Gumby is an unofficial motto for the United States Marine Corps, Navy fast attack submariners, and USCG personnel. 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." The real Latin phrase meaning "always flexible" is semper flexibilis.
While the first use of Semper Gumby is often assigned to Captain Jay Farmer of HMM-264 in 1984 who actually flew with a Gumby character toy mounted on the standby Compass on the instrument panel of his CH-46E nicknamed "Airwolf", the term was in use in 1977/78 in 1st Battalion, 5th Marines at Camp Pendleton.