Coast Guard Petty Officer 2nd Class Christopher Hartman, a K-9 handler at Maritime Safety and Security Team San Francisco, and his dog Evy conduct an interior sweep of an Alcatraz Island ferry while transiting San Francisco Bay Thursday, Oct. 4, 2012. Evy, a bomb-sniffing dog, is used to detect any kind of explosive material which may be brought aboard vessels during San Francisco Fleet Week. U.S. Coast Guard photo by Petty Officer 2nd Class Barry Bena
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