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they were around but the piller of autamn only brought the old stuff with them (don't know why) Because Bungie is lazy.Most of those things were prototypes and I guess were not proven to be combat-worthy.

There's also the fact that Reach was the sole producer of this military tech, and when it burned, there weren't many left. The prototypical equipment in Halo 3 was what was left.

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