Two players are required for this easter egg. Have both player go to one of the two buttons shown in the video below in the Rogue Transmission map, then have both players interact with the button at the exact same time to trigger the easteregg. If done correctly, a high pitch beep will sound when activating both switches at the same time. Then, eventually one of two dinosaur soundbites will play. You will hear trees falling down and either some grumbling or a roar. You may also see some trees move while the soundbite plays if you look to the right area of the map. Additionally, the soundbites may continue looping every couple minutes after being activated.
Search the following locations to find all 19 Dog Tags:
Baku tag 1. Nice Play - As the tutorial is starting, look at the bulletin board through the first door on the right to find it being held to the board with a knife. 2. One Way Trip - Near the courtyard. Before you drop down into the room where the first gadget weapon cache is found, jump over the hole in the floor to find it stuck to the shutters of the middle window. 3. Sergeant Dunn - After the building collapses on your squad and removing Dunn's leg, but before getting in the car to leave the area, go to the front of the crashed helicopter to find it in the copilot seat.
Shanghai 4. One Man Riot - Go right and down the very first alley, then go left at the end to find it attached to a door with a glowing red light. 5. Going Up - At the lobby of the hotel, look above the elevator to find it. 6. Business Casual - After the tank chase sequence, go to the back of the alley and look behind a tree to find it on a gate at the dead end.
South China Sea 7. Carcharodon - Start the mission and go down the first hallway. Look for the two men near the glowing red light at the end. Prior to reaching them, there is a barracks room on the right. Enter the room to find it on the top bunk bed. 8. Lord Of The Waves - After you swim underwater to find the G-46, your squad will surface in a room. Find the door with a glowing green light. It is behind the brown pillar on the left, near the debris. 9. Agent Kovic - After Hannah is rescued from the infirmary, the squad will return to the upper deck. Go outside, turn right, and find the copilot seat of the crashed helicopter to find it.
Singapore 10. Horizontal Rain - Start the mission and look near the empty white boat on the left to find it on the beach. 11. Armored Column - At the club where your squad gets into a fight, check behind the bar counter with the red stools to find it. 12. The Grounded Dog - Enter the hangar with the large white and blue passenger plane, then climb onto the left wing using the ramp to find it pinned to the plane door.
Kunlun Mountains 13. Cage Fighter - Meet back up with Irish after rescuing him, then look for the dark holding cells in the next room to the right. It is inside the last cell down the hall. 14. Freedom At Any Cost - In the room where you have to protect Dima while he hacks the control room, climb up to the catwalk, and scale the left wall to find it being held to a broken electrical box with a knife. 15. Shaw-Shanked Redemption - Before going up the big ramp to take the tram down the mountain, go underneath this platform, and walk to the ledge. Look down over the middle to see it sticking out.
Tashgar 16. The Destruction Enthusiast - After reaching the building in the park with the blue blankets hanging above the staircase (near the bridge), look for a blue truck ahead of another building in the park. Destroy it, then enter through the truck to find it. 17. Upstream Swimmer - Get to the base and defeating the enemy helicopter, climb the yellow ladder on the left to reach the top of the office building. Jump to the black scaffolding to find it.
Suez 18. The Rebel - While fighting on the flight deck, find the white plane on the left side of the deck. Climb onto the plane using the right wing, and walk towards the tail to find it stuck to the side with a knife. 19. Fleet Guardian - At the infirmary inside the Valkyrie, look on the right side (behind the second set of curtains) in the medbay to find it on one of the beds.
Note: The Dragon's Teeth DLC is required. There are two switches on the Lumphini Garden map that can be activated to get the Levolution event. Near each switch are two doors that can be opened by using C4. Enter the door located west of where the D flag is located in Conquest Large mode to find a radio on the floor. If a player has the Franchise Veteran Dog Tag equipped, the radio will play the Battlefield 1942 theme song when he or she interacts with it
Note: The Dragon's Teeth DLC is required. Complete the "Big Splash" assignment which involves activating the floodgates on the Sunken Dragon map and getting five kills while swimming. Once done, complete the "Recoil Kinetics" assignment by reaching a rank of "10" and using the Unica 6 to get twenty headshots.