Secret Intelligent Service is the intelligence-gathering department of the British government. The term "MI6" is a popular name used by the media to refer to the department's true name "Secret Intelligence Service." The group operates under the wing of the Joint Intelligence Committee alongside MI5, Government Communications Headquarters, and Defence Intelligence Staff. During World War II, MI6 decrypted German enigmas revealing Axis positions and spreading black propaganda among countries under the control of Nazi Germany. During the Cold War, the department unveiled Soviet ICBM, IRBM, and MRBM bases. After the conflict, the SIS shifted its attention to Ireland and the nuclear threat in the Middle East.
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Battle vs. CIA Special Activities Division (by Omnicube1)
Five CIA SAD agents make their way into an abandoned corporate building. They move silently wielding their weapons; the leader is carrying the FN SCAR Light, two of his subordinates carry the LR300, the weapons specialist wields a Suppressed SIG Sauer P226 and carries Semtex, and the sniper shoulders the SR-25. Suddenly, they hear a clanking noise coming toward them. They see it is a No 77 Grenade. The leader shouts for them to take cover, but the weapons specialist is too late and is showered in flames. Five MI6 operatives emerge from cover firing their guns. Their captain shoots his LR300, one fires the SIG SG 550 Sniper Rifle, two fire in succession with their FN Five-Seven pistols, and the other holds back priming another No 77 Grenade. He pops up and prepares to throw it, but the SAD leader fires his FN SCAR and tears his arm off. The grenade explodes. The two MI6 agents fire their Five-Sevens and are able to kill an SAD operative who fires his SIG Sauer as he falls, killing one of the MI6 agents. The SAD leader kills the other MI6 agent. The CIA sniper targets and fires his SR-25 at the MI6 sniper but misses.The British sniper fires back in full auto and riddles the enemy marksman with bullets. The MI6 squad leader charges forward firing his LR300. The CIA squad leader tries to terminate him but his weapon jams. He dives and grabs a suppressed SIG Sauer and shoots. The British leader collapses but is only wounded. He struggles to draw his Five-Seven but is killed by the CIA squad leader. The MI6 sniper targets and fires his sniper rifle at the CIA operative and kills him. The squad leader runs back and quickly sets a block of Semtex on a nearby desk. The two remaining MI6 agents chase after him firing their weapons. The squad leader ducks and presses the detonator. The Semtex explodes, tearing the Britons' bodies in half.
This was a rather easy win for the CIA, as they had far more combat experience than the SIS who relied on stealth, as well as a better arsenal, mainly because of their devastating semtex.