The Detection of Early lung Cancer Among Military Personnel (DECAMP) consortium is a multidisciplinary and translational research program that includes 7 Veterans Administration Hospitals (VAH), the 4 designated Military Treatment Facilities (MTF) and three academic hospitals as clinical study sites, several molecular biomarker laboratories, along with Biostatics, Bioinformatics, Pathology and Biorepository cores. The DECAMP Coordinating Center will facilitate rapid selection, design and execution of clinical studies within this multi-institutional consortium. The ACRIN 4704 study will recruit one cohort to achieve the aims of this study: a longitudinal screening cohort.