from Iraq.
Flash: the earth is a globe.
You must be looking at a Mercator Projection map. Try a globe or Polar Projection map. Use a string on a globe or ruler on polar Projection map from Iraq to various points in USA. These define the great circle route - the shortest path from point A to point B on the surface of the globe. It turns out if these don't go over Alaska, they come close.
An Alaska site would cover missiles from China as well. Russia is a problem. It's back to the DEW (Distant Early Warning) line.
[link|http://www.magmacom.com/~lwilson/dewline.htm#A|DEW line info.]