The research described in this report was prepared for the United States
Navy, the United Kingdom’s Ministry of Defence, and Australia’s
Department of Defence. The research was conducted within the RAND
National Defense Research Institute, a federally funded research and
development center sponsored by the Office of the Secretary of Defense,
the Joint Staff, the Unified Combatant Commands, the Navy, the Marine
Corps, the defense agencies, and the defense Intelligence Community
under Contract W74V8H-06-C-0002.