Under the Chiarelli plan "the military would shift about half of its 15 combat brigades away from battling insurgents and sectarian violence and into training Iraqi security forces as soon as the spring of 2007. ... About 4,000 U.S. troops are now serving on 11-person military training teams embedded with Iraqi forces. The new plan would add 30 troops to each team, allowing them to provide supervision and mentoring down to the level of Iraqi army companies. ... the remaining seven to eight brigades of U.S. combat forces would focus on three core missions: striking al-Qaeda, strengthening security along Iraq's borders, and protecting major highways and other routes to ensure U.S. forces freedom of movement in Iraq. ...