This paper discusses the relationship between Egypt’s military and security institutions, on the one hand, and the forces of the revolutionary movement since January 25 2011, on the other. It evaluates this relationship by looking at how it evolved during Egypt’s revolutionary and post-revolutionary periods. It achieves this by breaking events down into three main phases: an initial transitional phase managed directly by the Supreme Council of the Armed Forces (SCAF); Mohamed Morsi’s presidency; and the revolutionary movement after Morsi’s ouster. Based on observations of the three main junctures, this paper carries out a detailed reading of the major events in each phase and analyzes the impact that each had when it came to shaping the relationship between the military and security institutions. The paper sees distinct characteristics of the relationship between these central institutions at each phase, and assesses the impact of these different moments on the political process in Egypt more generally