Player Embed Code: Download Embed Share Sunrise Flag Unfurling at Pentagon Marks 9/11 Anniversary Defense.gov Sept. 11, 2021 | 13:01 The U.S. flag is unfurled at sunrise on the west side of the Pentagon near the 9/11 Memorial in honor of those killed in the terrorist attack. The flag unfurling marks the 20th anniversary and is followed by private and public ceremonies.