Three years and three months before Ryan Maseth stepped into a shower Jan. 2 in Baghdad, an Army safety specialist identified electrocution as a "killer of soldiers." Still, when the 24-year-old Shaler Green Beret turned on the faucet, water flowed from a pump powered by an improperly grounded electrical system manufactured in China. Borne on water, an electrical current surged through the pipes, out of the shower head and into his body. His heart stopped. Maseth's electrocution, the latest of 14 among service personnel in Iraq since 2003, set into motion a series of events to determine how and why...