PITTSBURGH - Crewmembers of the U. S. Coast Guard Cutter Osage (WLR 65505), homeported in Sewickley, Pa., assist other Coast Guard units with a safety zone along the Allegheny River, Wednesday, Sept. 24, 2009. The crew of the Osage set the buoys early Wednesday morning to give mariners a visual boundary of the Maritime Security Zone established along the Allegheny, Ohio and Monongahela rivers in support of the Pittsburgh Summit. U. S. Coast Guard photo by Petty Officer 3rd Class Stephen Lehmann.