The Defense Department's inspector general is planning this month to begin auditing hypersonic weapons research and development projects, a move that comes after Pentagon leaders announced plans to nearly double spending over the next five years on the new class of ultrafast weapons -- both offensive and defensive -- to more than $11 billion. In a Sept. 23 memo to Mike Griffin , the Pentagon's top technology officer, and other key Defense Department officials, the DOD IG's office announced an...