ST. PETERSBURG, Fla. -- Petty Officer 2nd Class Justin Keen, a trained oil observer serving at Coast Guard Sector St. Petersburg, tracks and documents oil on a C-130 overflight of the Gulf of Mexico in support of the BP Deepwater Horizon oil spill response July 8, 2010. Keen, an activated Coast Guard reservist, provides critical mapping information for oil trajectories using GPS coordinates and a camera. U.S. Coast Guard photo by Petty Officer 1st Class Judy Silverstein.