BC-303

The BC-303 is the production model of the X-303, which was introduced in 2003. While its predecessor, the X-303, was mostly based on incorporated Goa'uld technology, the BC-303 is mostly built on Asgard technology.

History
When the X-303 entered active service, it took the designation "BC-303" and the name Prometheus. It was the first, and for a long time, only deep-space battlecruiser constructed by the Tau'ri. In this capacity, it served as the flagship of the Tau'ri fleet under the auspices of the Office of Homeworld Security.

Though plans were made to construct an entire fleet of BC-303s, the introduction of the Daedalus-class battlecruisers rendered the craft obsolete, leaving the Prometheus as the sole vessel in its class.

When the Prometheus was destroyed in battle over Tegalus in 2006 the BC-303 class was taken out of service.

Technology
As with the X-303 the BC-303 was built using both Earth-based and alien technology, mostly of Asgard or Goa'uld origin.

Shields
The BC-303 utilized shields of Asgard origin, which were donated to them in 2003 as thanks for the help the Tau'ri had provided the Asgard in their conflict against the Replicators. Asgard shielding was first equipped to the Prometheus and eventually the Daedalus-class, allowing the Tau'ri to better defend themselves.

Asgard transporters
The Asgard first allowed the Tau'ri access to their beaming technology in 2005 during their conflict with the Wraith. However they placed a series of failsafes into the transporters to prevent the humans from using the technology offensively. Despite this, the Daedalus used its transporters to beam nuclear warheads onto several Wraith hive-ships (with begrudging help from an Asgard), destroying them. The Wraith, however, were able to develop jamming codes that prevented the transporters from obtaining a lock, making the transporters all but useless against the Wraith.

Besides individuals and small objects, Asgard transporters are capable of beaming large amounts of matter, from complete skyscrapers to entire fleets of ships.