The Ten Rings Base is one of the facilities operated by the Ten Rings terrorist group in Afghanistan. It is composed by a series of caves in the mountains, with a heavy arsenal of weapons located outside them.
Tony Stark traveled to Afghanistan in order to host a demonstration of the Jericho missile for the United States Armed Forces, and while returning to Bagram Air Base, his convoy was attacked by the Ten Rings. While unconscious from an explosion caused by one of his own weapons, Stark was kidnapped by the Ten Rings and taken to one of the Ten Rings Bases in Afghanistan, in order to film a video to their employer.
Upon his arrival, Stark had to be operated by Ho Yinsen who tried to remove the shrapnel that penetrated Stark's chest. Being unable to remove all the pieces, Yinsen inserted an electromagnet powered by a car battery to keep the shrapnel from reaching Stark's heart and killing him.
When Stark recovered consciousness, Yinsen explained his current condition and acted as his translator for their mutual kidnappers. Abu Bakaar, one of the Ten Rings members in charge of the base, instructed him to make a Jericho missile for them, and after being tortured and shown a vast arsenal of weapons developed by Stark Industries, he seemingly accepted.
However, Yinsen convinced Stark to make a difference in what could possibly be the last days of his life; so instead of making a missile, Stark and Yinsen developed a miniature Arc Reactor to increase Stark's chances of surviving the shrapnel injury, and they secretly started working on an armor powered by the reactor that would help them escape.
After working on the armor for three months, Stark and Yinsen formed a strong bond between one another. Unhappy with Stark's progress, Raza threatened to kill Yinsen and gave them an ultimatum, one more day to assemble the missile.
Stark and Yinsen finished assembling the armor, and Yinsen tried to distract the terrorists so Stark could charge the suit. Stark made his way through the base using the armor and killing the terrorists, only to find Yinsen critically injured, imploring him not waste his life with his dying breath.
Stark destroyed all the stolen weapons in the base and flew out of the area briefly using the armor's flight capabilities.