ST. PETERSBURG, Fla. -- Petty Officer 2nd Class Justin Keen, a trained oil observer, explains variances in the appearance and texture of oil to media embarked upon a C-130 overflight in support of the BP Deepwater Horizon oil spill response July 8, 2010. Keen, an activated reservist assigned to Sector St. Petersburg, is part of a team providing critical information for oil trajectory mapping. U.S. Coast Guard photo by Petty Officer 1st Class Judy Silverstein.