I found this: NIGHTMARE CF-188 409 Squadron CFB Cold Lake
409 Tactical Fighter Squadron is a unit of the Canadian Forces under Royal Canadian Air Force. The squadron operates the CF-18 Hornet from CFB Cold Lake in Alberta, Canada.
at this website:http://www.monitoringtimes.com/MilitaryCallsignList-APR09.pdf
Also found this:NIGHTMARE AV-8 MCAS Yuma AZ
at this website: http://mt-milcom.blogspot.co.uk/p/the-ron-perron-military-callsign-9-30.html