Following splashdown,while en route to Hawaii on the USS Hornet, Michael Collins crawled back into the command module (it was connected to the mobile quarantine facility by an air-tight tunnel) and wrote this short note on one of the equipment bay panels.  The inscription reads:

Spacecraft 107, alias Apollo 11, alias "Columbia."
The Best Ship to Come Down the Line.
God Bless Her.
Michael Collins, CMP

Excerpt from After Sputnik: 50 Years of the Space Age