G.F.S. Aegis

The Aegis was a spaceship mentioned in Metroid Prime: Federation Force. In one mission, it was under threat of destruction from interstellar missiles in the possession of the Space Pirates. A Federation Marine team dispatched by the Galactic Federation barely managed to destroy the Transport ships carrying these missiles before the Aegis could be destroyed.

The word "aegis" refers to protection, which this ship receives when the Federation attacks the Pirates before they can destroy the Aegis ship.

Related dialogue
"Pirates are attempting to bring down the Aegis with interstellar missiles."

"The Pirates have constructed interstellar missiles capable of destroying the Aegis. The missiles are being delivered via transport ship through a wormhole. It is imperative that you destroy those missiles before they can be delivered to the launcher."