I'll try to answer part of this, and then I'll hand it over to the chief.
It will soon be 2,500. If you look at the commitment to Afghanistan, you find that once the new organizations arrive, about half of them are the battle group or the fighting forces; the other half are either in command and control roles or support roles, etc. As the chief alluded to about 20 minutes ago, the idea is that we will try to draw upon air bases and navy bases to fill out some of the spots on the non-fighting side of the commitment.
On the fighting side of the commitment, we have to look at the numbers, but let's say we have some crewmen who are available for a certain time who could be re-roled into the infantry. They'd have to get some infantry training, etc. But there is no concept of taking sailors or airmen and turning them into combat arms.
I'll let the chief answer the rest of it, and about the reserves too.