SIMI VALLEY, Calif., Aug. 18, 2006 -- As during the Cold War, the spread of freedom remains America’s most valuable tool in combating the nation’s enemies, a senior Defense Department official said here yesterday. A slab of the Berlin Wall now housed at the Ronald Reagan Presidential Library in Simi Valley, Calif. Photo by Steven Donald Smith '(Click photo for screen-resolution image);high-resolution image available. “The power of freedom brought down the Berlin Wall in 1989, and it brought millions to the voting booth in Iraq and Afghanistan,” Christopher “Ryan” Henry, principal deputy undersecretary of defense for policy, said during a...