“Homelessness among military veterans has long been an endemic problem at the intersection of multiple public-health disciplines,” writes William D. Eggers in this Governing article. “Issues from substance abuse to housing prices to mental health care to re-training workers to disability access all contribute to veterans’ homelessness, and no one government agency — or level of government — owns the problem. … The story of how this happened carries important lessons for other cross-sector, intergovernmental efforts to solve some of America’s most pressing problems. It illustrates that what is called the ‘whole of government’ approach is more than a buzzphrase.” The article looks at Opening Doors, a federal strategic plan to end veterans’ homelessness launched in 2009, as an example of a whole of government approach.