This book assesses President Barack Obama's counterterrorism policy as it evolved throughout his presidency, from the expanded use of drones to the controversial decisions regarding the Syrian conflict. President Obama has achieved the dubious distinction of having been the longest continuous war president in American history, and this title explores how Obama pursued and expanded executive war power in key areas, simultaneously committing to a light footprint approach for U.S. military forces and emphasizing the use of drones, targeted killing of terrorists, and training, advising, and assisting local forces to defend themselves from militant groups such as ISIL. It also provides an in-depth analysis of the defining issue of the Obama counterterrorism strategy: Syria, and his refusal to militarily commit to defeat Bashar al-Assad and support Syria’s insurgency. The work concludes with a consideration of counterterrorism policy post-Obama.