A New Commander, in Step With the White House on Iraq

WASHINGTON, Jan. 5 — The selection of Lt. Gen. David H. Petraeus to serve as the senior American commander in Iraq signals an important turn in United States strategy.

As a supporter of increased forces in Iraq, General Petraeus is expected to back a rapid five-brigade expansion, in sharp contrast to his predecessor, Gen. George W. Casey Jr., who has been openly skeptical that additional troops would help stabilize the country.

Having overseen the recent drafting of the military’s counterinsurgency manual, General Petraeus is also likely to change the American military operation in Baghdad. American forces can be expected to take up positions in neighborhoods throughout the capital instead of limiting themselves to conducting patrols from large, fortified bases in and around the city.

The overarching goal of the American military operation may be altered as well. Under General Casey, the principal focus has been on transferring security responsibilities to the Iraqi security forces, so American troops could gradually withdraw. Now, the emphasis will shift to protecting the Iraqi population from sectarian strife and insurgent attacks.

Since his appointment was disclosed Thursday, General Petraeus has not spoken publicly about his plans for Iraq. But the doctrine he has advocated suggests that he will want all five of the combat brigades slated to go to Iraq as quickly as possible instead of waiting for them to be phased in....