The Joint Chiefs of Staff continue examining how long servicemembers should serve in Iraq, but for now they are satisfied the tour lengths are about right, Marine Gen. Peter Pace said.

General Pace, who was flying back after leading a weeklong United Service Organization trip to the U.S. Central Command area of operations, said Jan. 3 the service chiefs have examined the policy carefully over the past two years.

Iraq tour lengths are different among the services. Airmen generally deploy for four months. Marines and Sailors serve about seven months. Soldiers generally spend a year with "boots on the ground."

General Pace said he hadn't heard complaints about tour lengths from the troops, but has been told of concerns.

"It boils down to the way that each service employs its force, and how best then to assure that they get the most out of the people they have," the general said.

For example, the Marine Corps is tied to Navy ship deployments and that drives their six- or seven-month deployment.

"When the Marines do the math, they figure they can get the most out of Pfc. Pace in six- or seven-month deployments inside a normal four-year commitment," General Pace said.

For the Army, with brigade rotations and the heavy commitment of reserve component forces, officials deemed a year was the proper length of service.

"The Air Force works with a lot of guardsmen and reservists blended into their units," the general said. "So as they look at it, a four-month rotation works very well."

General Pace said the differing tour lengths are confusing and frustrating to those on the ground.

"But in Washington, it makes sense for each of the services to be doing what they are doing,” he said. “But that doesn't mean we won't keep looking at the situation.”