PLASTIC PROTECTION Airmen from the Illinois Air National Guard spread sheets of plastic over reinforced levees along the Mississippi River near Pleasant Hill, Ill., June 19, 2008. The plastic sheets prevent erosion that could cause the levee to fail and flood thousands of acres of farmland and homes. SHARE: Download: Full Size (0.09 MB) Credit: VIRIN: 111945-N-KUM50-527.jpg Photo Gallery