Cocodrie, La. - Members of a Rapid Assessment Team (from left to right), environmental scientist Leland Hales, Coast Guard Reservist Mike Kelleher, and sample scientist Michael McMains, investigate and collect tar balls discovered on the south shore of Timbalier Island, La., approximately 25 miles southeast of Cocodrie, La., Friday, September 03, 2010. RAT teams are multi-agency response teams under the Deepwater Horizon Incident Command System designed to respond to initial reports of potential oil on the Gulf Coast and in the Gulf of Mexico for assessment and sampling. RAT teams are composed of a boat captain, an oil observer, a sample scientist, and a Coast Guard liaison and receive information and coordinates from Coast Guard field observers or other incident personnel who report potential oil in the Gulf Region. Coast Guard photo by Petty Officer 3rd Class Nate Littlejohn