FAQ

In real life, an individual such as Wilson would have been charged and imprisoned immediately for trying to commit murder. If Wilson was ready to kill a member of his own team during training, he would most definitely be able to go against his own side while abroad.

However, the movie was trying to portray the fact that the military was desperate to have people able of killing on-board; Wilson had demonstrated his willingness for violence, hence the reason why he was kept.

According to the DVD commentary, the director states that Wilson did not view Bozz as a person worthy of being a leader, nevermind being worthy to be in the army. Wilson despised Bozz for his views and actions, and therefore Wilson started expressing his anger physically.