As the Egyptian military cracked down on protesters last week, U.S.-made Apache helicopters flew overhead. The Egyptian military also uses American made tanks, fighter jets and bullets. This is the product of the $1.3 billion in military aid the U.S. provides to Egypt every year. In polls, a majority of Egyptians say they want that aid to end. And it's become unpopular among some powerful Americans as well. Yet, so far, the aid hasn't stopped flowing. On today's show: Why it's so hard for the U.S. to stop sending military aid to Egypt.