Organizational Citizenship Behavior (OCB) is an established psychological construct that represents work behavior that is not required but contributes to improved organizational performance. This study examined the relationship of cognitive job satisfaction and OCB in a military organization. Several demographic variables previous identified to be related to OCB were also measured. Cognitive Job Satisfaction was significantly related to both self and supervisor ratings of OCB. The magnitude of correlations of pay and job cognitions with altruism and conscientiousness dovetailed with previous research results in field studies with much larger sample sizes. Government service civilians had significantly higher mean self-rated OCB than military personnel. Age and tenure were significant moderator variables in this relationship, but did not have significant main effects. Tenure was significantly correlated with self-rated OCB and both its factors, altruism and conscientiousness. Insufficient statistical power due to few respondents and range restriction due to pre-selection limited the ability to find significant group differences.