Air Traffic Control

National Air Traffic Controllers Association (NATCA)
Air Traffic Control Association (ATCA)  
National Business Aviation Association (NBAA)

Defense

American Society of Naval Engineers (ASNE)
Association for Communications, Electronics (AFCEA)
Association of the United States Army (AUSA)
Canadian Defense Industry Association (CDIA)
Navy League

Corporate

Aerospace Industries Association of Canada (AIAC)
Object Management Group (OMG)
Women in Defence and Security (WIDS)