Military cooperation is one of the most intriguing dimensions of the Qatari-US relationship. It has progressively evolved, driven by a changing geopolitical landscape and security threats in the Middle East. In fact, it has a significant impact on the overall bilateral relationship, especially economic ties. It rests upon four pillars: a bilateral defence agreement, the use of military facilities, arms sales and military-to-military contacts. This paper analyzes the development of the military relationship that exists between Washington and Doha and offers an assessment of the issues that animate it.