Recent statement of Air Force aircrew simulator policy reaffirmed that Aircrew Training Devices (ATDs) are an integral part of aircrew training programs. The Tactical Air Forces (TAF) have adopted a concept for a family of ATDs to support aircrew training needs. The family of ATDs includes: Cockpit Familiarization Trainers (CFTs), Egress Procedures Trainers (EPTs), Part Task Trainers (PTTs), Cockpit Procedures Trainers (CPTs), Operational Flight Trainers (OFTs), and Weapons Systems Trainers (WSTs). The training available from this family of ATDs varies from simple repetition of tasks required for safe aircraft operation to full mission rehearsal in a simulated combat environment. Safety-of-flight training is a core requirement for any aircraft training program, while practice of warfighting skills enhances survival in combat. A family of ATDs allows specialization of training devices to satisfy safety-of-flight and warfighting simulation requirements. This paper discusses how the family of ATDs concept evolved, defines the type and capability of each type of ATD, comments on acquisition strategy, and discusses user acceptance issues important to integration of ATDs into training programs. Although this paper is limited in content to aircrew training, the family of ATD concept has broad application to any training program that uses training devices to simulate actual equipment employed in a real environment.