Dynamic Test Facility with Shuttle in place for testing.  Enterprise arrived at Marshall March 13, 1978 and shortly afterward was assembled into a full stack for vibration testing.  This was the first assembly of a Space Shuttle stack.
NASA
1978-03-15
<a rel="nofollow" class="external free" href="http://pdfhost.focus.nps.gov/docs/NHLS/Photos/85002806.pdf">http://pdfhost.focus.nps.gov/docs/NHLS/Photos/85002806.pdf</a>