Mission set?
Stop with the bureau-speak gibberish. You refer to "massive numbers" -- i.e., twenty thousand (20,000) and you think that is ... "massive"??? Quit drinking the Kool-Aid. We had a headcount of over one half million (>500,000) in Vietnam alone, circa 1968-69. That doesn't even begin to take into account the rest of the world at the time.
Consider adding 500,000 trigger pullers today, now that would be "massive".
Ever heard of "90 day wonders" ??? ... while perhaps not the "ideal", when motivated and well-led, they can sometimes accomplish ... "wonders".
But ... the bottom line ... if you are going to fight an extended war and not burn out your people ... you need bodies, lots of bodies.
You need the military draft.
Believe it.
But thats just the thing, we're not over there to fight an "extended war." The administration and congressional powers that be have made it very clear that this is not the 10+ year commitment that some of the "Just another Vietnam" people have made it out to be. Every day you hear about exit strategys and if with the abismal approval rating of the war people will simply not support such a move as putting bodys in uniforms with a draft.
And thats exactly what you would need to suddenly surge 20000 troops in a matter of a few months. Most people realize that this war has through 2007 to do something drastic (i.e. either end or withdraw) and if it doesnt enough people are fed up in this country with the a non-victory (I didnt say loss just not victory) that they will vote for anyone who promises to get us out of it whether that is the smart/right decision or not. So if it cant happen all of a sudden and be the clean cut victory that we've all come to expect from the most powerful (be it politically hamstringed) military on Earth then we as a majority seem to want to take our ball and go home.