- Anonymous101
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- Elder Legendary Member
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Simple explanation: The Pillar of Autumn did not have BR's in their armory. Also, the members of Spartan Gray Team used battle rifles long before the events of FOR - however, it was probably unknown to any other Spartan/military group, because in first strike it is mentioned that BR's were in the field starting in 2552.
Halo: CE didn't have them for above reason, but I think my explanation in a teensy bit more suitable.