This chapter examines the role of the Colombian military during the Havana peace negotiations in shaping policy decisions regarding demobilization of guerilla forces. It uses semi-structured interviews with individuals involved in the negotiations to provide an important glimpse into the behind-the-scenes policy negotiations that led to specific provisions in the agreement. It also describes the role of the military in the Colombian peace process. The chapter refers to an analytical model for the logistics of demobilization used by negotiators in Havana and the specific tasks undertaken by the military during the negotiations. It seeks to serve as a point of departure for other peace processes as other countries also strive for an end to their own armed conflicts.