The increasing complexity of military systems, reduced quality and availability of personnel, and reduced resources have made Weapons System Support and Readiness (WSSR) more and more difficult to maintain. This paper discusses surrounding issues and proposes a system concept for developing, combining, and integrating advanced training, job performance aiding, and Artificial Intelligence (AI) technologies in order to reduce the time and cost of maintenance actions and their instruction. In particular, expert systems coupled with video disk and other presentation and I/O technology will allow expert problem solving skills and knowledge to be made available to relatively inexperienced technicians, embodied in an integrated maintenance Job performance Aiding/On-the-Job Training (JPA/OJT) system. A key component of the system will be an "explanation facility" through which the underlying reasoning of the system can be imparted to the technician. The basic objective of the OJT component is to build the conceptual knowledge of the technician rather than have him/her simply execute instructions. Since the expert system will handle the dual role of job performance aid and intelligent tutor, it is anticipated that the separation between maintenance actions and maintenance training will eventually become less distinct. Consequently, maintenance training equipment as we know it today can be expected to be gradually superseded by some form of "intelligent maintenance assistant."