A son of Louis Hilaire Guidry and the former Edna Barbay, he graduated in 1952 from Catholic High School in Baton Rouge. In 1957, he earned a bachelor's degree in Business Administration from [[Louisiana State University]] in Baton Rouge and received a Reserve Officers' Training Corps commission as a second lieutenant in the [[United States Army]] Infantry. He served in the 31st Judge Advocate General Corps before being honorably discharged with the rank of major.<ref name=obit>Judge Carl Guidry | Obituary | The Advocate, accessed February 8, 2025.</ref> | A son of Louis Hilaire Guidry and the former Edna Barbay, he graduated in 1952 from Catholic High School in Baton Rouge. In 1957, he earned a bachelor's degree in Business Administration from [[Louisiana State University]] in Baton Rouge and received a Reserve Officers' Training Corps commission as a second lieutenant in the [[United States Army]] Infantry. He served in the 31st Judge Advocate General Corps before being honorably discharged with the rank of major.<ref name=obit>Judge Carl Guidry | Obituary | The Advocate, accessed February 8, 2025.</ref> |