Fort Stewart —- The U.S. military's top uniformed officer told an audience of Army troops Wednesday that the unpopular "stop loss" policy won't end anytime soon, and he predicted a small rise in the number of troops forced to serve past their re-enlistment or retirement dates.

Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, told an audience of 600 soldiers at Fort Stewart that he understands the strain the stop loss practice and multiple deployments to Iraq and Afghanistan have placed on service members.

"I would like to see an end to the stop loss policy, but I don't see it happening in the near future," Mullen said during a question-and-answer session with the troops. "I see a slight growth in the next couple of years based on predictions right now."

Mullen said about 11,000 Army troops are now serving under the stop loss policy, which critics have referred to as a "backdoor draft."

Retaining troops beyond the date they're due to leave the military has been necessary to keep units stocked with trained soldiers ready to deploy to Iraq and Afghanistan, he said.

Concerned about burnout, the Army is working to grow by about 22,000 soldiers, to 547,000 on active duty.

The expansion will make it easier to cease the stop loss policy, Mullen said, as well as extend the time troops spend at home between deployments to two years rather than one.

But that won't happen for up to three years, Mullen said.

"What I worry about is ... you come up to the end of your obligation and you go. And we can't afford to lose you," he said. "There's a finite amount of gas left in this tank. And in my view we've used at least half the tank."