Another Trillion Dollars

That's the latest estimate of the cost of providing Iraq and Afghanistan veterans with disability and medical care and related services.  That's about $40,000 for each of the 2,500,000 soldiers who served in those wars.  Clearly, the cost is so high because of the number who have been deployed more than once; about one-third have.  The War on Terror will have produced more disability claims per veteran than our 20th century wars.  Why is that?  The number of deployments?  A different style of war? The volunteer army?