Tombstone Squad

Tombstone is a squad of Navy Seals set to appear in Battlefield 4.

Baku
Tombstone squad was sent to Baku, Azerbaijan to obtain some intelligence from a defecting Russian general regarding Chang, a Chinese military admiral, and his plans of staging a coup in China. The squad is successful in retrieving the intel, but they are discovered by Russian Special Forces troops as they try to escape from the city.

After an Mi-28 Havoc destroys their extraction helo, Dunn, the squad leader, has part of his right leg amputated to free him from the rubble of a destroyed factory, the squad drives off in a Civilian Sedan to their secondary extraction point.

However, the Mi-28 from before tails them and Recker kills the crew, causing the Mi-28 to crash in front of Tombstone's car forcing Recker to veer off into the sea. After a heated argument, Recker shoots the front window to allow Tombstone to escape the sinking car, but at the cost of Dunn's life as he was trapped under a seat and could not be freed in time.

It is revealed Tombstone's efforts to obtain the intel were all for nothing as an unknown caller states this while talking to an unnamed US Navy Captain, all while ordering him and his fleet to head towards the east coast of China.

South China Sea
Tombstone squad was tasked with infiltrating the USS Titan, an attacked aircraft carrier that was part of the ill-fated 7th US carrier group off the coast of Singapore, and retrieving any information as to what happened to the fleet.

After reaching the command room and retrieving the needed information, the squad is ambushed by Chinese soldiers. However, the "Titan" then starts to split in half, forcing the squad to traverse its runway, which is littered with destroyed aircraft.

Upon reaching the end of the runway, Kovic, a CIA operative attached with Tombstone squad, spots an abandoned DV-15 Interceptor and tells the squad to use it in order to get back to the USS "Valkyrie", their main base of operations. However, a failed gun run on them causes a jet to crash onto their Interceptor, leaving the squad possibly stranded from the "Valkyrie".

Trivia

 * On June 11, 2013, a Dogtag was released to Battlefield 3 Premium members; TOMBSTONE SQUAD ENLISTED was inscribed on it, referring to Tombstone squad.