Updated

Increasing numbers of U.S. troops have left the military with damaged bodies and minds, an ever-larger pool of disabled veterans that will cost the nation billions for decades to come - even as the total population of America's vets shrinks.

Despite the decline in total vets - as soldiers from World War II and Korea die - the government expects to be spending $59 billion a year to compensate injured warriors in 25 years, up from today's $29 billion, according to internal documents obtained by The Associated Press. And the Veterans Affairs Department concedes the bill could be much higher.