WASHINGTON, May 26 (UPI) -- Six U.S. soldiers have been diagnosed by the military with permanent brain damage from an anti-malaria drug used in Iraq and Afghanistan, and health officials must reassess its safety, a U.S. senator said. Sen. Dianne Feinstein, D-Calif., in a letter to Health and Human Services Secretary Tommy Thompson, said the drug, called mefloquine, has "serious risks" that have not been adequately tracked by the Pentagon, the Peace Corps and other government agencies that distribute it. "I ask that you work with the Food and Drug Administration to reassess the safety of mefloquine," Feinstein wrote Thompson...