(Washington-AP) -- The military's Joint Chiefs of Staff has issued new orders for troops to go to Iraq. Pentagon officials plan to publicly release details today. Defense Secretary Donald Rumsfeld says the troop rotation will send the Marine Corps back to Iraq. A Marine spokeswoman at Camp Lejeune says the base hadn't received deployment orders yesterday, but cautions that doesn't mean it's not going to happen. The Pentagon intends to mobilize specialists from the reserve components of the Air Force and Navy instead of relying almost exclusively on the Army to provide reserve forces for support.