This red cell analysis illustrates through case studies the capacities and capabilities of the Islamic State (IS) terror organization at its peak, and the Haqqani Network over time as individual organizations, including their origins, ideology, leadership, organizational structures, and operational capabilities, to examine global terrorism with a focus on the ideological warfare challenges of combatting radical Islamic terrorism. These organizations' connections to al Qaeda and the parts they play in the greater rising threat of global radical Islamic terrorism are established in order to frame global terrorism from a strategic historical standpoint to evaluate counterterrorism strategies for the future. The author presents strategy recommendations for the United States Intelligence Community (IC) and policy makers to effectively address the national and global security threats posed by transnational terrorism, using a combination of strategic counterintelligence and targeted ground operations, along with an original seven-principle approach to effective counterterrorism operations, as well as a broader strategy for targeting the ideological roots of radical Islamic terrorism.