This volume constitutes a commentary on the First Optional Protocol to the United Nations Convention on the Rights of the Child, dealing with the involvement of children in armed conflicts. It is part of the series, A Commentary on the United Nations Convention on the Rights of the Child, which provides an article by article analysis of all substantive, organizational and procedural provisions of the CRC and its two Optional Protocols. For every article, a comparison with related human rights provisions is made, followed by an in-depth exploration of the nature and scope of State obligations deriving from that article. The series constitutes an essential tool for actors in the field of children’s rights, including academics, students, judges, grassroots workers, governmental, non- governmental and international officers. The series is sponsored by the Belgian Federal Science Policy Office.