ACE is an association of Christian ministers who have a God given calling and vision to bring the gospel of Jesus Christ to unreached people groups and who desire to work together in a Christian spirit of co-operation, love and mutual respect towards this end.

ACE was launched by Richard Gunning of Reach The Unreached Ministries (RTU) in obedience to clear direction from the Holy Spirit in July 2001 to "raise up a team of evangelists who will go to the unreached." A conference of interested ministers plus RTU's National Directors was called in Belfast 4 - 6 October 2002 to launch and develop this association.

ACE is led by Richard Gunning of RTU (Northern Ireland) assisted and advised by Rickard Lundgren of Gå Ut Mission (Sweden), Harald Mydland of Troens Bevis (Norway), and Martin Goodchild of RTU (England).