I haved loved them ever since I can remember them (Halo 2). I have been told many times that they were in Halo1. I don't remember. But I have loved them ever since I saw Johnson and John in the HEV before Delta Halo.
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It does look big. I thought that too. Possibly, mount. Half of the fun of waiting is to see what we think happens. Maybe she has a family member down in this sector who's squad was overrun and she wants to investigate. Very improbable, but it would give Halo a personal touch. A more human way of thinking instead of run and gun.