A new poll released Wednesday reveals one in three of all post 9/11 U.S. military veterans think the wars in Iraq and Afghanistan were not worth fighting.

A new poll by the Pew Research Center found that although they're proud of their work overseas, a majority of former service members think America should focus less on foreign affairs and more on problems at home.

Nearly 4,500 U.S. troops have died in Iraq and about 1,700 in Afghanistan. Combined war costs since the Sept. 11, 2001, terrorist attacks have topped $1 trillion

The poll also finds that post 9/11 military veterans are more likely to disapprove of President Obama's job performance and are more likely to call themselves Republicans.

They also are more likely than earlier generations of veterans to have no religious affiliation.

The Pew Research Center, a nonpartisan organization that studies attitudes and trends, called the study the first of its kind.

The results were based on two surveys conducted between late July and mid-September.

One survey polled 1,853 veterans, including 712 who had served in the military after 9/11 but are no longer on active duty.

Of the 712 post-9/11 veterans, 336 served in Iraq or Afghanistan. The other polled 2,003 adults who had not served in the military