Digging up the Past

Digging up the Past is an achievement in Halo 4 and Halo: The Master Chief Collection. It is awarded when the player finds and accesses John-117's record during the level Dawn. In Halo 4, the achievement is worth 20 Gamerscore and is represented by the Office of Naval Intelligence emblem. In Halo: The Master Chief Collection, it is worth 5 Gamerscore and is represented on the Steam icon by a Mark V[B] helmet and an image of the map Skyline in the Xbox art.

Method
The location of the terminal is located right under the cryo bay. In the beginning of the level, instead of heading straight into the room where there's a hologram of the frigate, turn left and look for a staircase that leads to the lower floor. At the far end of the room, there is the terminal that contains John-117's service record.

Trivia
The service record incorrectly labels the as a frigate. In actuality, it was a Halcyon-class cruiser.