ISIS has made a heckuva start. It currently controls a huge swath of land in northern Syria and western Iraq, including the city of Mosul, won at great sacrifice by the U.S. during the Iraq War. Fighters from North Africa, the Middle East, the former Soviet states, Western Europe and even China are swelling the ranks of ISIS daily. Hisham al-Hashimi, an Iraqi security expert, estimated that there may be as many as 100,000 ISIS fighters. The CIA believes they max out at about 31,500, but that's still a formidable force. The U.S.-organized coalition of Bahrain, Jordan, Qatar, Saudi Arabia and the United Arab Emirates and their more than 2,500 air strikes are not enough. We need American boots on the ground, and in massive numbers, before more territory is lost. Imagine if we had been able to stop Hitler in his tracks in 1939 before he invaded Czechoslovakia.