U.S. Commission on National Security/21st Century
The U . S . Commission on National Security/21st Century ( USCNS/21 ) , also known as the Hart-Rudman Commission or Hart-Rudman Task Force on Homeland Security , was chartered by Secretary of Defense William Cohen in 1998 to provide a comprehensive review of US national security requirements in the 21st century . 
<triplet> William Cohen <subj> Secretary of Defense <obj> position held