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The next testimony is from Mujari. He explains the first time he came into contact with the Agency and the Syphon Filter virus. In 1984, he was working with the African National Council in Mpumalanga, South Africa, to free enslaved Africans under apartheid rule. Mujari enters a set of mining tunnels only to find out that his rescue efforts are in vain; all the slaves are dead. He keeps the South African samples; Lipan, who works for The Agency, comes to his lab, sees the samples and asks Mujari to work on the virus for Pharcom.

When it is Xing's turn to testify, she describes the events in Kabul, Afghanistan, during the Soviet conflict in 1987 and her side of the Costa Rican operation. In the former flashback, she is an MSS agent gathering evidence of Soviet troop movements led by Uri Gregorov. She is ambushed by the Soviets but rescued by Logan, a U.S. Army Ranger. Logan briefs Xing on his mission to deliver weapons to the local rebels, and Xing agrees to create a distraction for him. In the latter flashback, Xing discovers that Rhoemer has kidnapped many world-renowned scientists and medical technicians to work at his labs. Benton orders Lian to save the scientists in order to find out what the plants were used for. She is also ordered to collect a sample of the virus, collect data disks, and destroy computers containing the data. During the mission, it was revealed that Elsa Weissinger was one of Rhoemer's lab technicians. It has also been discovered that plants are necessary for creating the Syphon Filter virus.

While others testify, Logan, with an MI-6 team led by Margeret Powers, tracks one of the last shipments of the Syphon Filter virus to Dublin, Ireland. Logan plants explosives on the S.S. Lorelei ship and recovers the shipping manifest. They come under attack from the IRA, who discovers the Agency's plans to drop off viral containers. It is revealed that they had already unloaded several truckloads of the virus while the bombs were planted on the ship. Logan and the team prevent the trucks from leaving the area while eliminating a double agent.

After his mission in Ireland, Logan testifies about his role in Afghanistan in 1987, which reveals how he and Ellis were recruited into the Agency. Logan, Ellis, and Benton are the only survivors of a destroyed supply convoy. Upon entering Kabul, Xing's diversion leaves the convoy's route temporarily unguarded, with the exception of a tank guarding the town square. Gabe destroys the tank using a C-4 explosive and reveals to Hadden that Benton's contact is not an Afghan rebel but a Soviet agent. Benton does not work for the CIA but for the Agency, which is supplying weapons to the Soviets. However, Benton kills the Soviet agent and orders the protagonists to leave the weapons for the rebels.

Logan's intelligence leads Xing and Powers to the Tanami desert in Australia, where Weissenger is running the medical end of the operation. Xing intends to kidnap Weissenger, take photographic evidence of genocide, sabotage the terrorist group, and rescue the soon-to-be-executed Aborigines. After the kidnapping, Xing forces Weissenger to synthesise the vaccine. Before going off to save the villagers, Weissenger gives Xing information about Mara Aramov as an insurance policy in case Aramov double-crossed her. Weissenger leaves when Xing returns to the helicopter.

Hadden accuses Logan of killing Lipan, but Teresa herself appears and reveals that she faked her death. She testifies about her first day as an ATF agent in Western Montana, Paradise Ridge, during the early 1990s. She receives a call from two FBI agents saying that they need backup in order to take down a militia sniper. Teresa provides backup for the agents but ends up in a conspiracy. A militia survivalist named Earl Oakton, captured by the agents, is executed in cold blood. The supposed FBI agents are really corrupt NSA agents bent on killing the Oakton family to acquire satellite data. Logan, disguised as one of the agents, captures and then rescues Lipan from execution. Logan is concerned about retrieving the data, while Lipan does her best to save the militia and her fellow ATF agents from the NSA agents. She eventually meets up with the Oakton family (or what is left of them), recovers the satellite data, and extracts them from the area with Logan.

At the end of her testimony, Lipan reveals that she shadowed Hadden the entire time to discover that Aramov is his accomplice. Logan appears with federal agents with a warrant to arrest Hadden. Aramov barges in and shoots all in sight, but Logan and Lipan evade her. Logan pursues Aramov while rescuing captured federal agents along the way. He also searches for codes to disarm planted bombs. Logan eventually enters a Washington Metro train, on the same lines he confronted Aramov in 1999, and shoots her.

Upon Aramov's capture, Gabe became the head of the Agency, later known as the IPCA. However, Aramov escapes from prison. A post-credit cut scene shows Aramov recovering a shipment of the Syphon Filter virus from the S.S. Lorelei's wreckage.