ANVIL Station

Anvil is a United Nations Space Command space station seemingly in orbit around Earth. The secret military platform is utilized by the Spartan-IV soldiers, who train together in war exercises to sharpen their battle skills and test experimental technology.

History
Dating back as early as 2553, the ANVIL initiative indicates a number of very select joint training engagements between SPARTAN-IVs and Sangheili of Arbiter Thel 'Vadam's Swords of Sanghelios.

List of appearances

 * Halo 5: Guardians
 * ''Halo Online