CEF stands for Child Evangelism Fellowship. They have been around since 1937 and their mission is to reach children worldwide. Let me tell you a little bit about it from their website.
Child Evangelism Fellowship (CEF ) is a Bible-centered, worldwide organization that is dedicated to seeing every child reached with the Gospel of the Lord Jesus Christ, discipled and established in a local church.
CEF has many different ministries for children, but the three primary ones are the Good News Club, the 5-Day Club and the Truth Chasers Club.
CEF provides classes to train their workers and other Christians who are burdened for evangelizing children.
CEF Press produces and distributes Bible and missionary lessons and related materials for use in teaching children to help accomplish the goals of the ministry.
An exciting program for teenagers is Christian Youth In Action (CYIA).