This Snippet below is from 2010. You can see where they announce use of Hundreds of Walmarts Across the Country:
Homeland Security Secretary Janet Napolitano announced the unusual alliance Monday on the department's blog and in a promotional video posted to YouTube.
“Homeland security starts with hometown security, and each of us plays a critical role in keeping our country and communities safe,” she said. "This partnership will help millions of shoppers across the nation identify and report indicators of terrorism, crime and other threats to law enforcement authorities.”
Should the war on terror be fought in the aisles of Wal-Mart stores?
At least 200 Wal-Mart stores will roll out security announcements within 24 hours, Wal-Mart spokesman Dan Fogleman said. By month's end, 588 stores in 27 states will be participating in the program. A short video featuring Napolitano will appear on TV screens at select checkout lanes, asking Wal-Mart shoppers to contact local law enforcement to report suspicious activity.

http://www.nbcnews.com/id/40552073/ns...

Rise Together:
https://www.youtube.com/watch?v=jrfoz...

http://paulding.com/forum/topic/10778...

http://www.oocities.org/walmarttunnels/

http://paulding.com/forum/topic/10690...