This is an authoritative study of the methods used by the U.S. military to test, select, classify, and assign personnel to their various roles and ranks. U.S. Army research in personnel selection and classification has made significant contributions to the field of personnel psychology. This book describes the rich history of this research. With each era, the book highlights trends and advances in selection and classification. It also contains chapters describing specialized methods for selecting officers, special operations personnel, and other specialties.