This monograph is an analysis of the impact of organizational culture on tactical joint warfare. The merger of the Tiger Brigade with 2d Marine Division during the Persian Gulf War serves as a laboratory for this analysis. The author researched after action reports, the papers of authors who have written on the Persian Gulf War and interviewed commanders and key staff of both units to determine whether differences in service culture reduced the combat effectiveness of either unit. This research is analyzed using a recently developed organizational theory that postulates that the human element is the most important and least understood factor in determining whether a merger between two organizations with different cultures will succeed or fail.This study concludes that the merger of the Tiger Brigade and 2d Marine Division was very successful. The key elements to that success were the relationship between the commanders, the effectiveness of liaison officers, the willingness of both units to learn from and understand the culture of the other and the amount of time available before actual combat to reduce cultural barriers.