“…For example, published reports available at that time (circa 1970) about several occupational groups that were carefully prescreened prior to entry-into-training revealed training-attrition rates ranging from 22% to 43%. Among these were attrition rates for Peace Corps volunteers (Gordon, 1967); nursing students in their first year of training (Katzell, 1968); nursing turnover in a teaching hospital (Saleh, Lee, and Brien, 1965); Army officer candidates during 23 weeks of training (Peterson and Lippitt, 1968); and naval aviation students (Bale and Ambler, 1971). …”