Petty Officer 1st Class Brian O'Neil, a marine safety technician from the Marine Safety Detachment in Sturgeon Bay, Wis., checks a reference while inspecting an over-the-water fuel transfer in Sturgeon Bay, July 30, 2013. Coast Guard MSTs play an essential role in enforcing regulations for the safety of the marine environment and the security of the port. (U.S. Coast Guard photo by Petty Officer 3rd Class Britan Nagel)