One of the costs of war is higher unemployment:
Gender Values: The Costs of War, by Susan Feiner: At ten years and counting, the wars in Iraq and Afghanistan are the longest in U.S. history. Not surprisingly, they are the most expensive, with total war spending poised to top two trillion dollars early this summer. ... The U.S. government's spent over $2,000 per capita on all aspects and accouterments of war. ...
Spending on the military counts for a huge share -- 58 percent -- of U.S. discretionary federal spending. If military funding were redirected to meet critically important social needs, the nation as a whole would reap enormous benefits. ...[gives examples]
This military spending has yet another negative economic impact, and that's on the labor market. The largest share of military spending goes to weapons procurement, not to pay soldiers or other military personnel. The consequence of this is that it closes off employment opportunities in fields where women are most likely to earn decent salaries.
Dollars spent on the military and dollars spent on domestic programs like health care and education call very different jobs into existence. According to an important study by the Political Economy Research Institute (PERI),... one billion dollars spent on education or health care would create many more jobs than does spending the same amount on military projects. When the nation spends one billion dollars on the military, 11,600 jobs are created. If that billion dollars was spent instead on education 29,100 jobs would be created. And if it were spent on health care almost 20,000 jobs would be created. The military currently rips through more than $600 billion per year. If ... $300 billion were spent instead on education and health care, the employment picture would shift dramatically. The sum of $150 billion spent on education would create over four million jobs. Spending another $150 billion on health care would create about three million jobs. Adding the two sets of new jobs together, and subtracting out the military jobs that are lost, yields 3.8 million new jobs,... driving the unemployment rate to down from the current level of nine percent to under seven percent.
The positive benefits of such a change for women can't be understated. ...
[Also see Stiglitz and Bilmes.]