 To counter guerrilla attacks, the IDF set up the elite Egoz Reconnaissance Unit, an elite unit of the Golani Brigade, which was to conduct raids against guerrillas, and Roi's unit was among those selected to be its founding members.As a result, Klein became a member of the Golani Brigade, and would rise through its ranks.Klein served in the southern Lebanon security zone before being honorably discharged from the army in August 1998.