This study will enroll people with COPD who are undergoing lung transplantation. Before the lung transplantation surgery, participants will attend one study visit, which will include a medical history review, height and weight measurements, and a blood collection. A portion of blood will be stored for future genetic research. Participants will also complete questionnaires to collect information on activities, health, and quality of life. Some participants will undergo a 3-Helium magnetic resonance imaging (MRI) procedure, which is an imaging technique that allows doctors to see the air spaces inside of the lungs. After the lung transplantation surgery, study researchers will collect lung tissue from surgery. Study researchers will contact participants at the end of the study to collect follow-up medical information.