Originally, Kitsom was from a group home for individuals with insufficient cognitive ability in Reno, Nevada. Upon induction into the United States Army, his recruiter, seeking to meet a quota, added 12 points to his I.Q. scale in order to meet the required I.Q. requirement for military service. Kitsom was declared dead in Operation Iraqi Freedom as a Private First Class in the United States Army. He was wounded by a road side bomb, leaving him with severe burns and other war related injuries. After Kitsom was declared dead he was then transferred to Outcome and given the identity Aaron Cross. In the process of becoming Aaron Cross, Kitsom was trained and guided as an intelligence asset that involved deep cover identities and other clandestine special operations under the direction of the Department of Defense. He is trained in the use of several foreign languages, small arms, hand-to-hand combat, and other intelligence gathering related trade craft. Kitsom was also genetically enhanced physically and mentally through two of his chromosomes. It increased his muscle efficiency, reflexes, strength, and the ability to suppress extreme pain. It also improved his mental capacity to operate as a field operative similar to that of Jason Bourne. It not only made him more intelligent; however, he also has the ability to improvise and solve a problem or problems thinking in a linear tactical fashion.
The objective of Operation Outcome was to deploy highly trained assets who were genetically modified in order to do any number of intelligence operations mainly information gathering in highly hostile environments. Each operative in Operation Outcome are given two pills as medication to continue their abilities to operate as intelligence assets. Each Outcome operative is dependent on such medication as way to "control" each agent from becoming rogue in his or her operational status. One pill enhances mental capabilities dubbed as the blue pill and the other pill enhances the physical capacity of the agents which is declared as the green pill. In the film The Bourne Legacy, Cross mentions that if a member of Operation Outcome is deprived of such pills or "Chems" as witnessed in training, the agent will go back to their original state before joining Outcome. In the case of Aaron Cross, his mental capacity would be well below normal and he would be unable to live unassisted. In turn he fears the loss of his intellect.