This comprehensive contribution to understanding veterans' healthcare uniquely draws on a national and international cadre of scientists and practitioners, both within the Department of Veterans Affairs and specialists beyond the institution, providing a matrix view of veterans healthcare, past, present, and future, both nationally and internationally. This work will prove an essential reference set that examines and identifies veterans' healthcare through the first decade of the 21st century, invaluable to health and psychology researchers and students, policymakers, social workers, and veterans. It is organized to cover four key elements: Volume I presents a history of veterans' healthcare, the various veteran's eras, and the global healthcare provided to our veterans. Volume II examines several of the programs of care and veterans' special needs. Volume III is devoted to the several aspects of mental health care, treatment, and rehabilitation services offered to veterans through the healthcare system and the last volume offers insights into future directions for veterans' healthcare.