Washington, D.C. Attack - 911 - September 9, 2001
An Eagles View Collection, Page 2

To the left was generally known as the "Helicopter Facility" at the Anacostia Navy Annex.  It houses Marine One (HMX-1) and various Secret Service Helos.  This was and remains a no unauthorized personnel area with immediate Marine response. All of them were rolled out while military helos landed at the Pentagons River Annex to evac senior personnel.