Izsak Rizan Pusel (informally known as Zsak Pusel) was a special operator for the United Nations Space Command and later Tactical Security Applications, a privatized security service based on his homeworld of Taradia. During his tenure with Tactical SA, Pusel first operated solely as a field operator and later as an adviser/instructor, although he continued his role in special applications infantry until his death during the First Battle of Sanghelios. Izsak conducted dozens of operations against both insurgent and alien forces during this time, a number of which he had composed himself.