U.S. troops are losing confidence in the military's long-term chances of success in Afghanistan, a new poll has revealed.

The Military Times survey found less than half of serving soldiers believe the U.S. is 'very likely' or 'somewhat likely' to succeed in Afghanistan.

The number is down from 2007, when more than 75 percent of those polled said the U.S. was 'very likely' or 'somewhat likely' to succeed.