Echo 206

Echo 206 was a Pelican dropship attached to the UNSC Pillar of Autumn in 2552. When that vessel crashed on Installation 04, this dropship was spared from destruction by its pilot, who launched it as the Autumn descended into the atmosphere.

The vessel then met up with other human survivors at Alpha Base where it was assigned to run supply missions from the Autumn to Alpha Base, along with Pelican Echo 136.

This Pelican is most likely piloted by Second Petty Officer Polaski and although the designation is not mention in Halo: First Strike, there is no mention of it being destroyed so this is the best candidate for the pelican in the book.