Conceptual model describing the Millennium Cohort Study research areas among service members and veterans through the life course. Reproduced from the following article that is published under the terms of the Creative Commons Attribution-Noncommercial-No Derivatives (CC BY NC ND) License. Belding JN, Castañeda SF, Jacobson IG et al. The Millennium Cohort Study: The first 20 years of research dedicated to understanding the long-term health of US Service Members and Veterans. Ann Epidemiol 2022;67:61–72. doi: 10.1016/j.annepidem.2021.12.002. Epub 2021 Dec 11. PMID: 34906635