I think the fact that Soyuz flies twice a year (plus the Progress flights, which use a lot of the same assembly lines, being closely related vehicles) confuses a lot of people into thinking that since its an expendable vehicle, there must be a stockpile of them. But Russia doesn't have the funding to build up a stockpile; while NASA spends money servicing the Orbiter, Russia is spending money to build the next Soyuz vehicle.<br /><br />Regarding swapping vehicles due to hail damage, I seem to recall that NASA did consider swapping the *tank*. But this would've meant a longer delay, since of course then they'd have to wait for yet another tank to be delivered for the launch-on-demand vehicle. (Since of course swapping tanks means they've decided it will take too long to repair the damaged one.)<br /><br />The big problem is that this stuff is expensive and just plain *big*. It's not practical to have a stockpile unless you're operating with a huge budget surplus and want to keep idle employees busy. (And unfortunately NASA is not in that position right now.) <div class="Discussion_UserSignature"> <p> </p><p><font color="#666699"><em>"People assume that time is a strict progression of cause to effect, but actually from a non-linear, non-subjective viewpoint it's more like a big ball of wibbly wobbly . . . timey wimey . . . stuff."</em> -- The Tenth Doctor, "Blink"</font></p> </div>