Because it looks like they are going to delay the Iraq withdrawal:

The U.S. military has prepared contingency plans to delay the planned withdrawal of all combat forces in Iraq, citing the prospects for political instability and increased violence as Iraqis hold national elections next month.

Under a deadline set by President Obama, all combat forces are slated to withdraw from Iraq by the end of August, and there remains heavy political pressure in Washington and Baghdad to stick to that schedule. But Army Gen. Ray Odierno, the top U.S. commander in Iraq, said Monday that he had briefed officials in Washington in the past week about possible contingency plans.

I understand that there need to be contingency plans, but the fact that this gets leaked to the Washington Posts means that they are looking to see if a delay is politically feasible for them to further extend Operation Useless Dirt 1.^*

So in August, 3 months before the election, they are going to push back the withdrawal, and they expect the base to be enthused about working for the Democratic party.

The Obama administration is beginning to make the Carter administration look like Niccolò Machiavelli.

A few more months of this, and I might be ready to vote green.^†

The equation here is very clear: Military operations are very good for careerist military officers, so you will always have a significant portion of the military arguing for these operations, since it benefits them personally.

You need to ignore them.

^*H/t Eric Palmer for this bon mot describing Operation (insert name here).
^†Not really, pulling the lever for the Greens would have vomiting in the voting booth.^‡
‡But yes, actually vomiting in the voting booth might be a real possibility.