Rear Admiral Daniel Judson Callaghan (July 26, 1890 – November 13, 1942) was a United States Navy officer who received the Medal of Honor posthumously for his actions during the Naval Battle of Guadalcanal. In a career spanning just over 30 years, he served his country in two wars. He served on several ships during his first 20 years of service, including escort duties during World War I, and also filled some shore-based administrative roles. He later came to the attention of US President Franklin Roosevelt, who appointed Callaghan as his Naval Aide in 1938. A few years later, he returned to command duties during the early stages of World War II. Callaghan was killed by an enemy shell while in command of a task group on the bridge of his flagship, the USS San Francisco (CA-38), during a su