The five essays in this Agora, written by Jack Goldsmith and myself, Ashley Deeks, Ryan Goodman, Rebecca Ingber, and Michael Ramsey, consider the legal legacy of the Obama administration concerning the use of military force, with respect to both domestic law and international law. Prominent developments during the Obama administration relating to war powers include the administration's defense in habeas litigation of its authority to detain members of Al Qaeda and associated groups in military custody; its increased use of targeted killing outside of active combat areas, in part through frequent missile attacks carried out by drones; its use of military force in 2011 against the regime of Libyan leader Muammar Qaddafi, pursuant to a United Nations Security Council resolution; its deliberations in 2013 about the use of military force against Syria in response to the use of chemical weapons by the regime of Syrian President Bashar al-Assad; and its initiation of a long-term conflict against the Islamic State in 2014. This Agora touches on these and other developments and offers a range of perspectives.