To play "Don't Back Down" by Eminem, do the following. Locate the three red rotary phones throughout the Pentagon that ring and flash. The first phone can be found after you opening the set of doors in the corner at the start. The second phone is located on the catwalk circling the room after leaving the first elevator. The third phone is located in a room after leaving the second elevator on the floor that the power is on. Listen for a ringing sound to find the phones. Look at the phone, then hold [Action] until you hear a busy signal. After the third phone is accessed, the song "Don't Back Down" by Eminem will play.