President Barack Obama, right, is greeted by Col. Jennifer Walter, center, Vice Wing Commander, Iowa Air National Guard and Lt. Col. Shawn Ford, Operation Group Commander, Iowa Air National Guard Base, upon his arrival at Des Moines International Airport, Thursday, May 24, 2012, in Des Moines, Iowa. (AP Photo/Pablo Martinez Monsivais)

Associated Press
President Barack Obama, right, is greeted by Col. Jennifer Walter, center, Vice Wing Commander, Iowa Air National Guard and Lt. Col. Shawn Ford, Operation Group Commander, Iowa Air National Guard Base, upon his arrival at Des Moines International Airport, Thursday, May 24, 2012, in Des Moines, Iowa. (AP Photo/Pablo Martinez Monsivais)
President Barack Obama, right, is greeted by Col. Jennifer Walter, center, Vice Wing Commander, Iowa Air National Guard and Lt. Col. Shawn Ford, Operation Group Commander, Iowa Air National Guard Base, upon his arrival at Des Moines International Airport, Thursday, May 24, 2012, in Des Moines, Iowa. (AP Photo/Pablo Martinez Monsivais)
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