For some reason when I go to the place where the ternimal is on Cortana and I press RB where you are suspose to and it shows Cortana saying something but the thing doesn't open.
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Are you doing it in solo and also make sure you don't get a checkpoint this might mean not killing all the enemys and if you trying to get the acheivement marathon man this is not one of the seven terminals you need to colect if you do want this acheivement I have a full guide if you want it send an email asking. Also if you have the halo 3 guide book please do not look at the book about any of the acheivements because the book can somtimes be misleading as it was written before the game was finished being made
Something similar to this happened to me, I was playing co-op and when I tried opening one of the terminals it didnt work so try it on solo and there is alreadya guide here on SuperCheats that explains to you how and where to get the terminals here http://www.supercheats.com/xbox360/guides/halo3/terminallocations.shtml
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