This is Progress?

Would someone please explain to me how the troop surge is supposed to secure Baghdad when we can’t even secure the Green Zone? Today’s blast wasn’t the first time the security around the heavily fortified Green Zone was breached. In spite of past attacks, it seems that security there has not improved.

In a separate incident, a truck bomb detonated during rush-hour brought down a huge section of the al-Sarafiyah bridge, killing 10 and sending cars plummeting into the Tigris River below.

At the risk of sounding defeatist, does it really matter how many troops we have there?