The USS Courage is an aircraft carrier appearing in the anime, during the Waking the Dragons arc.
The crew observed the unusual phenomena carried out by Paradius. Since the country's central rule fell under the control of Paradius, they were unauthorized to fight against them. Instead they asked Yugi Muto and Seto Kaiba for help, as they understood Duel Monsters had a huge role in Paradius' plans and Yugi and Kaiba were among the world's best Duelists.
In the real world, the USS Courage (PG-70) was the name given to the ship the HMS Heartsease (K15), while serving the United States Navy during World War II.