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Cognitive ability is the most widely researched psychological construct in studies of determinants of occupational performance. Results of meta-analyses of common selection methods in personnel psychology indicate that general mental ability (g) is the best predictor of training and job performance involving core technical proficiency. For training, the predictiveness of g is incremented by measures of personality and specialized job knowledge. For job incumbents, the predictiveness of g is incremented by personality, job knowledge, and work sample performance. In addition to the predictive validity of g, personality, and prior job knowledge, their role in the acquisition of additional job knowledge and subsequent job performance has been demonstrated in causal models. These results are consistent with those for diverse military occupations including pilots and several enlisted technical specialties. Several studies are reviewed examining the relations of g and other common selection constructs to training performance for military jobs including air traffic controllers.