Apollo

The USS Apollo, commonly referred to as just the Apollo is the fourth Daedalus-class battleship in the Tau'ri fleet. Just as the Daedalus, the Apollo was deployed to the Pegasus galaxy shortly after its commissioning in 2007.

Latest service
Even after Atlantis returned to Earth, the Apollo—including the Daedalus—continued to provide support in the Pegasus galaxy. With the Apollo severely damaged after the encounter with the ZPM-powered hive-ship, it did remain grounded for two years.

After the President of the United States shut down the Stargate Program, the Apollo was grounded, while the Daedalus continued to travel to Pegasus. It was only recommissioned after the second Destiny-incident proved the Lucian Alliance to be a threat to Earth. It was given a new crew under the command of Captain Jack Mathis after Homeworld Command reorganized the military structure; the fleet now became under the command of the Navy and thus its structure.

In 2012, the Apollo was sent to P7J-620 to investigate the source of a transmission they intercepted. Shortly after arrival, it was attacked by three Lucian Alliance ships. Even though not all systems were fully operable, the ship still managed to withstand the attacks. After Stargate Command lost contact with the Apollo, they sent in SG-1 to investigate. Shortly after SG-1 arrived, the ship crashed down to the planet.