New Jerusalem

New Jerusalem was a large human colony world in the Cygnus system. The city of Mount Haven was located on the colony. It was discovered by the Covenant late in the Human-Covenant War and was known to be defended by the 26th Marine Expeditionary Force, who suffered 'near annihilation' in the Battle of New Jerusalem. Following the battle, the UNSC forces retreated from the planet, leaving it to be glassed by the Covenant. The Rookie fought at New Jerusalem as part of the 26th Marine Expeditionary Force, before transferring to his current unit.

Trivia
New Jerusalem is named after the city of Jerusalem in Israel, located on Earth.