Of course we would like to see other governments do more to fight jihadists. But the ones in Iraq and Syria are not pushovers, and whatever forces confront them there have to be strong enough, and skilled enough, so there is no question about winning any fight. This president should have left behind a powerful peacekeeping force in Iraq, like the one the U.S. has maintained in South Korea for sixty years, but somewhat smaller. One very competent study estimated the force needed at about 25,000 total.
About half this number would be made up of three Army Combat Aviation Brigades dispersed to several bases, and a few thousand special forces working with whatever local infantry units could be formed. The other half would be various units defending and supplying the bases, maintaining equipment, and supporting the combat force in other ways. Only about one-fourth of the total number would have assignments that would involve them in combat. The centerpiece of this force would be quick-reaction units of helicopter-borne infantry, about 1,200 in all, on call at several bases and very heavily supported by armed helicopters and other aircraft.
What we are seeing now is the start of a much smaller effort whose main element is the 3d Armored Brigade Combat Team of the 4th Infantry Division. This brigade, which will take some time to reach Kuwait from Colorado, is not nearly as mobile as the aviation brigades suggested in the study, but it is much heavier than one of them. It normally would have, for example, eighteen 155mm. howitzers, several dozen armored fighting vehicles, and as many as a hundred heavily armored main battle tanks.
This is not a quick-reaction force--it would not be able to pursue jihadists in pickup trucks very well, or rush to reinforce local fighters who had come under fire. The idea behind it seems to be to give the put the smallest possible number of U.S. servicemen in harm's way while giving them the most possible protection.