Terminal 1(level the ark)

The first time you go inside, you will see a door almost immediately on the left.  Simply enter this area of the level to find the first of the seven terminals.

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Terminal 2(level the ark)

When you go inside the structure to let the tanks across the bridge of light, there will be a Terminal almost directly behind the controls for the bridge.  It’s an easy find!

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Terminal 3(level the ark)

You’ll miss this terminal if you are not careful.  After defeating the scarab, you will head into a large structure.  There will be a room with several sleeping grunts.  Nearly directly following this room is another room in which you can take two different directions.  There is a door, and a staircase (both eventually lead to the next room).

Underneath the staircase is an additional door that leads to the 3rd terminal.

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Terminal 4(level the convenent)

When you access the first Elevator leading to the tower controls, jump from the elevator platform to the platform on the opposite side from where you accessed the elevator from.  The terminal is dead ahead.

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Terminal 5(level the convenet)

After getting a Hornet vehicle, fly towards tower 2 (the one that the Arbiter has already disabled).  A voice will remind you that Tower 2 is already clear, just to confirm you are at the right place.  The Terminal is just inside of the structure

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Terminal 6(level the convenet)

Terminal 6 is identical to Terminal 4, only in the 3rd tower.  Just jump to the platform, and there it is!

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Terminal 7(level Halo)

Terminal 7 is found at the beginning of the final level in Halo 3. To find it, simply head forward from the start of the level, until you encounter the area with a few structural beams going from one wall into another. At this point, turn right, and look for beam separate from the rest (as highlighted below
Follow this beam into a doorway. Cortana will ask you, “Where are you going?”. Turn left once inside, and the Terminal should be in view.

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