About NCCCO Introducing CCO| Corporate CCO Sponsors| Key Facts| CCO Certification Development| Organizational Structure| Accreditation | Cooperative Partnerships| Employment Opportunities at CCO| Policy Statements CCO Written Exam Testing Data Mobile and Tower Crane Operator Written Exam Aggregate Annual Test Data (through October 2014) Mobile Crane Operator Written Exam Statistics (2013) Tower Crane Operator Written Exam Statistics (2013)