The Optional Protocol to the Convention on the Rights of the Child on the Involvement of Children in Armed Conflict (OPAC), also known as the child soldier treaty, is a multilateral treaty whereby states agree to: 1) prohibit the conscription into the military of children under the age of 18; 2) ensure that military recruits are no younger than 16; and 3) prevent recruits aged 16 or 17 from taking a direct part in hostilities. The treaty also forbids non-state armed groups from recruiting anyone under the age of 18 for any purpose.