Joseph McCarthy was born on July 27, 1959, in Pittsburgh, Pennsylvania. He enlisted in the U.S. Navy on January 14, 1977, and went on active duty to begin basic training on August 9, 1977. McCarthy completed basic training in October 1977, followed by Gunner's Mate A School. He next attended Basic Underwater Demolition/SEAL training with Class 098 at Naval Amphibious Base Coronado, California, from February to August 1978, and then served with SEAL Team TWO at NAB Little Creek, Virginia, from August 1978 until he was killed in a traffic accident in San Juan, Puerto Rico, on February 9, 1981.

The Sailor's Creed:

I am a United States Sailor.

I will support and defend the Constitution of the United States of America and I will obey the orders of those appointed over me.

I represent the fighting spirit of the Navy and those who have gone before me to defend freedom and democracy around the world.

I proudly serve my country's Navy combat team with Honor, Courage and Commitment.

I am committed to excellence and the fair treatment of all.