During the second year of the Iraq War, a U.S. Army Explosive Ordnance Disposal team from Bravo Company is on a mission to neutralize an improvised explosive device utilizing a robot. However, when the vehicle transporting the trigger charge fails, Team Leader Staff Sergeant Matthew Thompson bravely steps in to place the charge manually. Tragically, he meets a grim fate when an Iraqi insurgent detonates the charge remotely using a cell phone. This incident leaves his squadmate, Specialist Owen Eldridge, grappling with guilt for not being able to eliminate the individual responsible.
Taking over from Thompson is Staff Sergeant William James, whose unconventional methods often cause friction, especially with Sergeant J.T. Sanborn. James prefers to tackle bomb deactivation without robotic assistance, which leads to tense moments; he once obstructs Sanborn's line of sight with smoke grenades while defusing a device moments before another insurgent tries to trigger it with a 9-volt battery. Their interaction escalates when James, after ignoring Sanborn’s warnings, dismissively takes off his headset and provocatively gestures at his comrade. This reckless behavior raises concern, prompting Sanborn to even consider the drastic option of fragging James.
While returning to base, the team encounters five armed men dressed in Iraqi clothing near an SUV with a flat tire. The atmosphere is thick with tension until they discern that these men are actually British private military contractors. Just as they begin to assist, the group is ambushed by snipers, resulting in the death of three contractors. In a fierce counterattack, James and Sanborn successfully take out three insurgents, with Eldridge neutralizing a fourth who tries to flank them.
In a harrowing raid on a warehouse, James stumbles upon a "body bomb," suspecting it belongs to an Iraqi boy named Beckham, known in the area for selling DVDs and playing soccer. Amidst a chaotic escape, Lieutenant Colonel John Cambridge, the unit’s psychiatrist and Eldridge's counselor, is killed in an explosion, adding more trauma to Eldridge’s psyche. In a reckless move, James tracks down Beckham's associate at gunpoint, insisting on being taken to Beckham’s home, but ends up at the residence of an unrelated professor before fleeing.
When called to the scene of a detonated petrol tanker, James’ relentless pursuit of the insurgents puts him at odds with Sanborn's pleas for caution. Undeterred, James ventures into the fray, prompting Sanborn and Eldridge to follow him. Their paths diverge, leading to Eldridge's capture by insurgents. After a daring rescue, Eldridge suffers a leg wound in the process. The next day, James encounters Beckham, who has miraculously survived, yet he chooses to ignore the boy, walking past him without acknowledgment. Eldridge, now injured, lashes out at James, blaming him for the ordeal.
As their deployment nears its end, the team is called to disarm a suicide bomb strapped to a captive man. Despite James' valiant efforts, the countdown forces them to abandon the man. This incident rattles Sanborn, who afterward confides in James his desire to leave the service to raise a son, feeling the weight of his near-death experience heavily.
Upon returning home after Bravo Company’s rotation, James finds himself unfulfilled living a mundane civilian life with his ex-wife Connie and their infant son. Confessing to his child, he reveals, "There is only one thing I know I love." Soon, he makes the decision to re-enlist, embarking on another year-long tour of duty with Delta Company, seeking purpose once more amidst the chaos of war.
