Journalist Andrea Mitchell has noted that General McChrystal's report to President Obama calls for 500,000 troops in Afghanistan. [That's not 500,000 U.S. troops, but 500,000 troops overall.] Mitchell correctly notes that if you don't believe that the goals in McChrystal's report for increasing the size of the Afghan army are realistic, that should lead you to question agreeing to send more U.S. troops, because the premise of the request for more troops is that if you add more U.S. troops there's going to be "success," and that success, apparently, requires 500,000 boots on the ground. If you don't believe there's going to be success even if you add more U.S. troops, then you shouldn't add more U.S. troops - you should do something else.
McChrystal has suggested that without more U.S. troops we will "fail" - but the same logic says that without more Afghan troops we will also "fail." If adding the additional U.S. troops will not lead to the required addition of Afghan troops, then U.S. policy will "fail," even with the additional U.S. troops.
Some have dismissed the concern occasioned by Mitchell's comments by saying of course there aren't going to be half a million U.S. troops in Afghanistan. It's certainly true that there aren't going to be half a million U.S. troops in Afghanistan. But supporters of sending more troops have to answer this: to defend sending another 40,000 U.S. troops to Afghanistan, they have to defend their scenario that there's going to be 350,000 Afghan boots on the ground. Otherwise - according to General McChrystal - their plan is not going to work. Furthermore, they should say now what they will propose then if adding 40,000 more U.S. troops does not produce 350,000 Afghan troops. Do they promise not to ask for more U.S. troops? Would anyone believe such a promise?