Baku

Baku is the first mission featured in the Battlefield 4 campaign. The mission was featured in the "Fishing in Baku" Reveal Trailer. The mission in Baku involves Tombstone Squad escaping with intel on Admiral Chang's relations with the Russians twelve days prior to the outbreak of the war.

Introduction
The mission begins in a screen of black with music playing. It is revealed that a radio is playing the music—the radio of a car fallen underwater. Four soldiers are shown in the car; Daniel "Reck" Recker, Clayton "Pac" Pakowski, Kimble "Irish" Graves, and an amputated William Dunn. Recker had just woken up from unconsciousness next to Irish. Dunn shortly began talking to Recker, complimenting his driving until "the end". He ordered Pac to turn on a light, revealing they were still sinking in the water. Irish attempted to move the seat, saying it was stuck and Dunn was pinned. Dunn tried to reassure him, saying the "worst thing they can do... is panic". Irish protested, saying that scared him. He told Pac to help him with his seat to free Dunn. Pac repeated that they were still sinking, with Irish swearing and optimistically telling Dunn they'd get him out. Pac realistically asked how, saying the doors were stuck shut because of the pressure. The front of the car shifted, spooking Irish. Dunn then told him this was not "how it was supposed to happen." He gave Recker his gun, quoting that "for the wolf to survive, it's gotta chew its own leg," with Irish demanding in disbelief what he meant. Dunn told Recker to shoot the glass, Irish persistently ordering for him not too. The player has the choice of shooting the window or not. Regardless, the scene cuts to black.

The Safehouse
The mission rewinds to fourteen minutes earlier. Recker is shutting a door whilst heavily breathing. He checks his rifle, which is out bullets and with none to spare. He sees Russian soldiers peeking through the windows, presumably in search of himself and the others of Tombstone. He makes his way through the building. Briefly after witnessing two searching soldiers, he opens a door. As birds fly out, he enters. Pac grabs him, ordering Recker to drop his gun. Realizing it's Recker, he lowers his pistol. Shortly after, Dunn arrives, startling the two. Dunn and Pac have a short exchange regarding the intel. Pac confirms he still has it. Dunn asks about Irish, to which Pac states his belief that he was with Dunn. Dunn then attempts to contact Irish via radio. Irish immediately replies that he is being pursued and coming from the north. Whilst Recker recovers ammo from an ammunition crate, Pac and Dunn tear down the boards covering the windows. After a couple moments of anticipation, Irish appears smashing through a window grappling with two dogs. As he takes cover behind a truck, two Russian operators arrive in close pursuit. Recker dispatches them, along with four others briefly after. Irish climbs up to the window, helped in by Pac. They continue through several corridors, eventually ambushing a roving patrol. The gunfire attracts reinforcements, igniting a firefight. Tombstone survives and continues on. They move into a dead end wall. The player has the option to destroy it with either an M320 grenade launcher or C4 Explosives.

To the Extraction Point
They traverse under a highway. As a train passes overhead, Dunn gives a SITREP to Fortress. As Recker is about to step into the valley towards the extraction point, Dunn gives him a Tactical Visor. He spots three trucks passing by. The third stops and drops its soldiers off who proceed to patrol the area. The way the player deals with these are to their discretion. Firebird 2-1, Tombstone's extraction helicopter, passes over. This takes the attraction of several soldiers. They pass over a ridge, discovering Tombstone. They engage each other. Hawkins, the Firebird 2-1 pilot, assists Tombstone with air support from her M134 Dillon machine guns. However, the engagement takes notice of the remaining soldiers ahead. Firebird continues giving support to Recker's discretion. More reinforcements arrive, but are still defeated by Tombstone. They continue through a drain pipe. On the other side, Hawkins comes under fire from RPGs. Just as Recker comes out of the drain pipe, one of the RPGS hits right next to him. Tombstone eliminates the soldiers defending the factory after an intense fight.

The Factory
They press on through the factory. As they take an elevator, an Mi-28 Havoc attacks them. They sprint to the roof of the building, desperately trying to evade the helicopter's fire. Hawkins had already landed and waiting for Tombstone. As Recker is just about to get into the chopper, the Russian attack helicopter makes another strafe and lands shots right in front of him. As he falls onto his back, Hawkins loses control of her helicopter. One of the factory smokestacks also becomes unstable as a result of the strike. It falls on to the roof, smashing it in and causes Recker to slide in. As he falls, he shoots down two Russian soldiers. He passes Dunn along the way. Luckily, he grasps the edge of the building just as he falls off the side. Seconds after, Dunn falls as well, but Recker catches him. Hawkins passes over and crashes to the ground. The wall that Recker is holding falls. His vision goes black, and he awakes to Irish digging him up. After Recker reorients and brushes himself off, he sees Pac trying to dress Dunn's wound. Said wound being his leg stuck under a piece of rubble. Irish yells at him about the fuel igniting. Then, a civilian arrives with a vehicle offering help to Tombstone. Irish tells him off, saying it is too dangerous. Dunn calls Recker over, ordering him to cut amputate his leg. Recker reluctantly complies. As Pac and Irish take Dunn to the truck, Recker drops his knife in shock. Recker also gets into the truck, driving away from the crash.

Escape
Recker drives the vehicle towards the USS Valkyrie, still pursued by the Russian helicopter. After making it to an oil field, the chopper lines up and fires rockets at Tombstone. Fortunately, Recker dodges the volley. As it passes over, Irish gives Recker an M320 to shoot it. Recker finally destroys it, but it crashes in front of them. He veers to avoid it, but crashes in the water. Thus, creating the intro scenario. However, it skips this and instead shows the remaining members of Tombstone swimming to the surface. A conversation can be heard between Captain Garrison and the "Oracle" regarding the intelligence recovered by Tombstone that reveals Russia's backing to Admiral Chang Wei.

Collectibles

 * The Nice Play Dog Tag is located in the green room to the right of the locker hallway. The door to the right of the tipped over locker leads to this room. Note that this is before Recker meets Pac and Dunn.
 * The M39 EMR can be found in the atrium after saving Irish and learning the Engage mechanic. It is found in a wooden box on the left side of the room where broken concrete leads to the second floor.
 * The One Way Trip Dog Tag is located above the hole the squad jumps in where the Gadget Box is introduced. Instead of jumping in the hole, the wall to the left must be hugged; a small concrete path will lead to a locked that can be vaulted over. The Dog Tag is on the brown cabinet.
 * The MG4 is found when emerging outside, after the Tactical Visor is given to Recker and Hawkins meets with the squad. There is a line of four concrete tubes on a slope, lined up parallel to the road in pairs of twos. The MG4 is in the very first one in line.
 * The CBJ-MS is found in the factory's front yard. After scaling the staircases to either the right or left sides, the CBJ-MS can be found on the first red support beam, near the center. The railings must be vaulted over to get onto the beam.
 * The Sergeant Dunn Dog Tag is found in Hawkins' helicopter wreckage when the squad is getting into the van. The tag is found hanging off of the cockpit window frame.

Trivia

 * The driving scene of the mission is very similar to the escape in the Cold War mission of Battlefield: Bad Company 2.
 * The Civilian SUV that is driven by Recker cannot be exited.
 * The "asset in China" referred to at the end of the mission is CIA Agent Kovic.
 * When the player must amputate Dunn's leg, if they look under the rubble where his leg is caught, it already appears to be cut off.
 * In the initial campaign reveal, Recker used an M16A3 as his standard primary weapon. In the final release, however, he uses a SCAR-H.
 * The song played from the radio in the opening cutscene is "Total Eclipse of the Heart" by Bonnie Tyler.
 * At the very start of the mission when Recker checks his magazine, upon finding that it is empty, he will curse. This is the only time in the entire game when he audibly speaks.
 * Despite speaking Russian, and using Russian weapons and vehicles, the enemies in this level, along with other missions in which Russian forces appear, wear Chinese flag patches on their uniforms. This may be because their model is also reused from the PLA Assault from Multiplayer, albeit with a different head.
 * In the underwater sequence at the start of the level, Recker is wearing an OCP pattern uniform. For the rest of the mission, however, his sleeves use the Tri-Color Desert pattern.
 * The civilian that abandons his SUV after the building collapse will run through solid rubble before disappearing.