Washington ? After failing to attract large numbers of foreign peacekeepers to Iraq, the Pentagon is drawing up plans to rotate in as many as 30,000 more reservists early next year, despite growing worries in Congress about strains on the force, defense officials said Tuesday.

These troops would join three 5,000-strong Army National Guard brigades already in line to go to Iraq as part of an expected yearlong rotation to replace U.S. troops now in Iraq. U.S. Marines also may be sent back into Iraq by February to ease the burden on overstretched Army forces.