The 19 Marines you mention were the ones killed by a Palestinian suicide truck bomb, right. That was 76 Marines killed and 115 wounded.
Click here to read about the Weinberger Doctrine. The current Afghanistan thing is no different than our raid on Tripoli in April 1986 after an attack on a Berlin Disco frequented by American servicemen -- just a different poster-boy of futility.
Are you even aware that the WTC was hit once before several years ago? We have already been attacked on US soil and you really want to believe we have no foreign enemies here?