I remember in Halo 3 there was a weird little buttom combination you could press that would allow for this. But yeah, it should definitely be a thing.
English
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There was one for Reach too that let you lower it so that it was out of view pretty much
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The halo reach one was something like all your buttons accept LB and some d pad ones and jump i think
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I think it was X, B, right thumb stick and down on dpad at same time and hold for about 10 seconds