. . . . . "Current and future worldwide threats to the national security of the United States : hearing before the Committee on Armed Services, United States Senate, One Hundred Eleventh Congress, first session, March 10, 2009"@en . . . . . . . . "Current and future worldwide threats to the national security of the United States hearing before the Committee on Armed Services, United States Senate, One Hundred Eleventh Congress, first session, March 10, 2009"@en . . . . .