Helicopter Association International (HAI)  
   Since 1948, HAI has been dedicated to promoting the helicopter as a safe and efficient method of transportation, and to the advancement of the civil helicopter industry.
   http://www.rotor.com/

AHS International - The Vertical Flight Society  
   The professional society for the advancement of vertical flight technology and its useful application throughout the world.
   http://www.vtol.org/

Army Aviation Heritage Foundation (AAHF)  
   Dedicated to presenting the Army Aviation story to the American people through transportable flying presentations and static displays of the actual aircraft and equipment used by the men and women
   http://www.armyav.org/

Vietnam Helicopter Pilots Association (VHPA)  
   The VHPA is a non-profit war veterans organization. It is dedicated to the helicopter pilots who servered in the Vietnam War.
   http://www.vhpa.org/

International Helicopter Firefighters Association  
   Firefighters and other helicopter wildfire firefighting associations who promote safety in aviation.
   http://www.ihogman.com/ihfa/index.html

South Carolina Helicopter Association  
   Promotes fair and just insurance rates for owners and operators and encourages helicopter safety.
   http://www.helicopter.org/

American Helicopter Society  
   The AHS is the focal point of the vertical flight industry and has been since its inception in 1943 for professionals interested in advancing the research and development of helicopters.
   http://www.ae.gatech.edu/research/rcoe/ahshome/ahshome.html

Vietnam Helicopter Crew Member Association  
   A nonprofit, nonpolitical, fraternal association always looking for former Vietnam helicopter crew members.
   http://www.blu.org/vhcma/

Popular Rotorcraft Association (PRA)  
   The PRA is an organization of rotorcraft enthusiasts, engineers, designers, builders, fliers, and local chapters.
   http://www.pra.org/