Apollo 11 insignia. At Scheer's suggestion, the CM was named "Columbia" after "Columbiad", the giant cannon that launched a spacecraft (also from Florida) in Jules Verne's 1865 novel "From the Earth to the Moon". It also referenced Columbia, a historical name of the United States. The astronaut had personal preference kits (PPKs), small bags containing personal items of significance that they wanted to take with them on the mission. Five PPKs were carried on Apollo 11: three (one for each astronaut) were stowed on "Columbia" before launch, and two on "Eagle". Neil Armstrong's LM PPK contained a piece of wood from the
Apollo 13 a couple of other pieces, the only other memento he possesses is a letter from Charles Lindbergh. The Apollo 13 crew patch featured three flying horses as Apollo's "chariot" across space. Given Lovell's Navy background, the logo also included the mottoes ""Ex Luna, scientia"" ("From the Moon, knowledge"), borrowed from the U.S. Naval Academy's motto, ""Ex scientia tridens"" ("From knowledge, sea power"). The mission number appeared in Roman numerals as Apollo XIII. The patch did not have to be modified after Mattingly's replacement since it is one of only two Apollo mission insignia—the other being Apollo 11—not to include the