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they dont have sheilds the covenate do, some advaced ships have shields but there oni shipsBecause they are NOT able to.Considering that they had to build the smallest fusion reactor in order to power shields on the MJOLNIR armour, and the power requirements need to power shields grows exponentially as is size increases, installing shields on their ships is not possible for the UNSC.because this late in the war the unsc will try to make more ships than fit them with time consuming sheilds.

Spartan Armor shields were expensive enough, I don't think they could apply large scale refit to use shields without tons of resources (AKA Money)

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