Aging is a process where the structural and/or functional integrity of components will be continuously degraded by exposure to the environmental conditions under which it is operated. This article discusses aging mechanisms in various components of military systems, such as structural parts, engines, and subsystems. It describes the aging management processes such as full-scale structural testing and practical life-enhancement methods. The article reviews control and prevention systems such as usage monitoring systems and health monitoring systems necessary to provide effective corrosion maintenance on military systems. Failure prediction techniques, namely, the equivalent pre-crack size approach, life-cycle cost modeling and simulation, and holistic life-prediction methodology, are also discussed.