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IAFST Mortgage Field Services Trade Association Who We Are The International Association of Field Service Technicians IAFST is an International Trade Association with Membership in Europe Canada and the United States. The IAFST leverages both Labor and Management to ensure optimal portfolio benefit while ensuring sustainabilityforall parties concerned. For years the Mortgage Field Services Industry has been divided and without a centralized location for Advocacy Business Development Education and Representation. Today that is over.