Iman Khalif is terrorist working for Al-Qaeda.
Iman Khalif was one of the subjects in Russia's Cobra tests, and was identified as having extraodrinary reflexes. Some time afterwards he went on to join Al-Qaeda.
When the Americans launched their own reflexes study, Khalif's status from the Cobra tests were brought to light, and thus he was noted to be one of the few people who could disarm the CincLock-VII security system.
Majestic-12 planned to initiate a Cold War by launching American Chameleon missiles at various places around the world, and started a bounty hunt to remove all those who would stop them, Khalif was put on their liquidation list.
Cowboy followed Demon's instructions to take Khalif's head (and a few others) to the French castle to claim the bounties. However when the Black Knight and Shane Schofield rescued Gant, they took with them the heads in order to use them to get access to the castle, claiming the bounties for them in the process.