Primary Pioneer Group

A Primary Pioneer Group is a possible Forerunner Naval fleet that searched for habitable planets. Advance Survey Team-Alpha is probably a smaller group of the Pioneers. A Primary Pioneer Group was sent to G617 g1 to observe the ecosystem of the planet, and it was there they encountered the Flood. After the Pioneers encountered the Flood, they disappeared. Advance Survey Team-Alpha was sent shortly after to investigate their disappearance. A Primary Pioneer Group also led the Forerunners to the discovery of Earth, where the Portal to the Ark was built by the Librarian as she was indexing all the creatures in the Galaxy.

List of appearances

 * Halo 3
 * Terminals

Trivia

 * As the nature of the pioneer group is unclear in the Terminals, it is entirely possible that the community of Forerunners living on Seaward (G617 g) were, in fact, the primary pioneer group or a group of Forerunners associated with it.