1,200 people who worked the flight 93 crash scene
40,000 people who worked the piles at Ground Zero
55 FBI Evidence Response Teams at Fresh Kills in New York
7,000+ FBI Agents
8,000+ people who worked the scene at the Pentagon
ACE Bermuda Insurance
AEMC Construction
AIG Insurance
Air Traffic Control System Command Center in Washington
Alexandria VA Fire & Rescue
Allianz Global Risks
American Airlines
American Concrete Institute
American Institute of Steel Construction
American Red Cross
Applied Biosystems Inc.
Applied Research Associates
Arlington County Emergency Medical Services
Arlington County Fire Department
Arlington County Sheriff's Department
Arlington VA Police Department
Armed Forces Institute of Pathology
Armed Forces Institute of Technology Federal Advisory Committee
ARUP USA
Atlantic Heydt Inc.
Bechtel
Berlin Fire Department
Big Apple Wrecking
Blanford & Co.
Bode Technology Group
Bovis Inc.
Building and Construction Trades Council
Bureau of Alcohol Tobacco and Firearms
C-130H crew in D.C. & Shanksville
Cal Berkeley Engineering Dept.
California Incident Management Team
Carter Burgess Engineering
Celera Genomics
Centers for Disease Control
Central City Fire Department
Central Intelligence Agency
Cleveland Airport control tower
Columbia University Department of Civil Engineering and Engineering Mechanics
Congressional Joint Intelligence Committee
Consolidated Edison Company
Construction Technologies Laboratory
Controlled Demolitions Inc.
Council on Tall Buildings and Urban Habitat
Counterterrorism and Security Group
CTL Engineering
D.H. Griffin Wrecking Co. Inc.
DeSimone Consulting Engineers
Dewhurst MacFarlane &Partners
DiSalvo Ericson Engineering
District of Columbia Fire & Rescue
DOD Honor Guard, Pentagon
D'Onofrio Construction
E-4B National Airborne Operations Center crews
Edwards and Kelcey Engineering
Engineering Systems, Inc.
Environmental protection Agency
Exponent Failure Analysis Associates
EYP Mission CriticalFacilities
Fairfax County Fire & Rescue
Falcon 20 crew in PA
Family members who received calls from victims on the planes
FBI Evidence Recovery Teams
Federal Aviation Administration
Federal Bureau of Investigation
Federal Emergency Management Agency
Federal Insurance Co.
FEMA 68-Person Urban Search and Rescue Teams: Arizona Task Force 1, California Task Force 1, California Task Force 3, California Task Force 7, Colorado Task Force 1, Fairfax Task Force 1, Florida Task Force 1, Florida Task Force 2, Maryland Task Force 1, Massachusetts Task Force 1, Metro Dade/Miami, Nebraska Task Force 1, New Mexico Task Force 1, New York Task Force 1, Pennsylvania Task Force 1, Tennessee Task Force 1, Texas Task Force 1, Utah Task Force 1, Virginia Task Force 1, Virginia Task Force 2, Washington Task Force 1
FEMA Disaster Field Office
FEMA Emergency Response Team
FEMA Urban Search and Rescue Incident Support Team-Advanced 3
Fire Department of New York
Fort Myer Fire Department
Fourteen teams of search dogs from Oregon
French Urban Search & Rescue Task Force
Friedens Volunteer Fire Department
Gateway Demolition
Gene Code Forensics
Georgia Tech Engineering Dept.
Gilsanz Murray Steficek LLP
GMAC Financing
Goldstein Associates Consulting Engineers
Guy Nordenson Associates
HAKS Engineers
Hampton-Clarke Inc.
HHS National Medical Response Team
HLW International Engineering
Hooversville Rescue Squad.
Hooversville Volunteer Fire Department
Hoy Structural Services
Hughes Associates, Inc
Hugo Neu Schnitzer East
hundreds of ironworkers, some of whom built the WTC
Hundreds of New York City Police Department Detectives
Industrial Risk Insurers
Institute for Civil Infrastructure Systems
International Association of Fire Chiefs
International Union of Operating Engineers Locals 14 & 15
J.R. Harris & Company
Karl Koch Steel Consulting Inc.
KCE Structural Engineers
Koch Skanska
Koutsoubis, Alonso Associates
Laboratory Corp. of America
Lamont-Doherty Earth Observatory
Leslie E. Robertson Associates
LIRo Engineering
Listie Volunteer Fire Company
Lockwood Consulting
M.G. McLaren Engineering
Masonry Society
Mazzocchi Wrecking Inc.
Metal Management Northeast
Metropolitan Airport Authority Fire Unit
Miami-Dade Urban Search & Rescue
Military District of Washington Search & Rescue Team
Montgomery County Fire & Rescue
Mueser Rutledge Consulting Engineers
Murray Engineering
Myriad Genetic Laboratories Inc.
National Center for Biotechnology Informatics
National Commission on Terrorist Attacks Upon the United States
National Council of Structural Engineers Associations
National Disaster Medical System
National Emergency Numbering Association
National Fire Protection Association
National Guard in D.C., New York, and Pennsylvania
National Institute of Standards and Technology (NIST)
National Institutes of Health Human Genome Research Institute
National Law Enforcement and Security Institute
National Military Command Center
National Reconnaissance Office
National Response Center
National Science Foundation Division of Civil and Mechanical Systems
National Security Agency
National Transportation Safety Board
National Wrecking
Natural Hazards Research and Applications Information Center
New Jersey State Police
New York City Department of Buildings WTC Task Force
New York City Department of Design and Construction
New York City Department of Environmental Protection
New York City Office of Emergency Management
New York City Office of the Chief Medical Examiner
New York City Police Department Aviation Unit
New York City Police Department Emergency Services Unit
New York Daily News
New York Flight Control Center
New York Newsday
New York Port Authority Construction Board
New York Port Authority Police
New York State Emergency Management Office
New York State Police Forensic Services
New York Times
North American Aerospace Defense Command
Northeast Air Defense Sector Commanders and crew
Numerous bomb-sniffing dogs
Numerous Forensic Anthropologists
Numerous Forensic Dentists
Numerous Forensic Pathologists
Numerous Forensic Radiologists
NuStats
Occupational Safety and Health Administration
Office of Emergency Preparedness
Office of Strategic Services
Orchid Cellmark
Parsons Brinckerhoff Engineering
Pennsylvania Department of Environmental Protection
Pennsylvania Department of Health and Human Services
Pennsylvania Region 13 Metropolitan Medical Response Group
Pennsylvania State Funeral Directors Association
Pennsylvania State Police
Pentagon Defense Protective Service
Pentagon Helicopter Crash Response Team
Pentagon Medical Staff
Pentagon Renovation Team
Phillips & Jordan, Inc.
Port of New York and New Jersey Authority
Pro-Safety Services
Protec
Public Entity Risk Institute
Purdue University Engineering Dept.
Robert Silman Associates Structural Engineers
Rolf Jensen & Associates, Inc
Rosenwasser/Grossman Consulting Engineers
Royal SunAlliance/Royal Indemnity
SACE Prime Power Assessment Teams
SACE Structural Safety Engineers and Debris Planning and Response Teams
Salvation Army Disaster Services
several EPA Hazmat Teams
several FBI Hazmat Teams
several Federal Disaster Medical Assistance Teams
several Federal Disaster Mortuary (DMORT) Teams
Severud Associates Consulting Engineers
Shanksville Volunteer Fire Company
Silverstein Properties
Simpson Gumpertz & Heger Engineers
Skidmore, Owings & Merrill LLP
Skilling Ward Magnusson Barkshire
Society of Fire Protection Engineers
Somerset Ambulance Association
Somerset County Coroner's Office
Somerset County Emergency Management Agency
Somerset Volunteer Fire Department
St. Paul/Travelers Insurance
State of Pennsylvania Emergency Management Agency
Stoystown Volunteer Fire Company
Structural Engineering Institute of the American Society of Civil Engineers (SEI/ASCE)
Structural Engineers Association of New York
Superstructures Engineering
Swiss Re America Insurance
Telephone operators who took calls from passengers in the hijacked planes
Teng & Associates
Thornton-Tomasetti Group, Inc.
TIG Insurance
Tokio Marine & Fire
Transportation Safety Administration
Tully Construction
Twin City Fire Insurance
Tylk Gustafson Reckers Wilson Andrews Engineering
U.S. Army Corps of Engineers
Underwriters Laboratories
Union Wrecking
United Airlines
United States Air National Guard
United States Fire Administration
United States Secret Service
United Steelworkers of America
University of Sheffield Fire Engineering Research
US Army Reserves of Virginia Beach Fairfax County and Montgomery County
US Army’s Communications-Electronics Command
US Department of Defense
US Department of Justice
US Department of State
Virginia Beach Fire Department
Virginia Department of Emergency Management
Virginia State Police
Vollmer Associates Engineers
Washington Post
Weeks Marine
Weidlinger Associates
Weiskopf & Pickworth Engineering
Westmoreland County Emergency Management Agency
Whitney Contracting
Willis Group Holdings
WJE Structural Engineers
Worcester Polytechnic Institute
World Trade Center security staff
XL Insurance
Yonkers Contracting
York International
Zurich Financial
Zurich Re Risk Engineering