Walter Reed Middle School - Accidentally used as backdrop in McCain acceptance speech?

On September 4, 2008 John McCain, addressing the Republican National Convention stood before a large screen. At the beginning of the speech the screen showed a large building with a lawn. The building is Walter Reed Middle School in North Hollywood, CA. Speculation is that the image used was mistaken for Walter Reed Medical Center.

Ironically the school was also used as a backdrop for the TV show West Wing:

http://www.youtube.com/watch?v=faTovfkLayI