The alleged incursions into Syria, and previously into Pakistan, could be risky.
Damascus lashed out at Washington over charges that American forces killed at least eight civilians when US helicopters were on a mission to shut down insurgent 'rat lines.'
Iraq's Shiite-led government has begun taking control of the anti-insurgent Sunni fighters who have helped improve security across the country.
But even in hiding, Al Qaeda in Iraq can carry out high-profile attacks and has infiltrated security forces.
Gen. David Petraeus, who handed over command on Tuesday to Gen. Raymond Odierno, will lead US Central Command.
His announcement raises concerns about the ability and loyalty of the ‘Sons of Iraq’ neighborhood-watch program.
Proposed February troop reduction would coincide with increase in troops sent to Afghanistan.
As his next report on troop levels nears, senior officers aren't sure they'll agree.
Anbar Province is where 1 of every 3 US fatalities in Iraq occurred.