RecruitingPhase 2Drug trialQuick Start Durvalumab Following Chemoradiation for Stage III Nonsmall Cell Lung CancerThis research study aims to determine what effects (good and bad) Durvalumab has on participants and their cancer with a "quick start" of Durvalumab within 14 days of finishing chemotherapy and radiation. The study will also determine the logistic barriers to the quick start of Durvalumab.