Valid passport and a valid nonimmigrant visa is required for a permanent resident of Canada who is a citizen of British Commomnwealth Country from March 17th 2003
http://a257.g.akamaitech.net/7/257/2422/14mar20010800/edocket.access.gpo.gov/2003/03-2164.htm
http://a257.g.akamaitech.net/7/257/2422/14mar20010800/edocket.access.gpo.gov/2003/03-2164.htm