This article, the first of a three-part series, describes how to develop an environmental test schedule for military, groundmobile equipment installed on a tracked vehicle based on the user's mission profile. The test schedules combine both operational and storage environmental stresses. Part I describes the equipment to be tested, provides a general overview of its mission profiles, and identifies appropriate climatic conditions. Part II discusses the complexities of the tracked-vehicle vibration environment, including research conducted in the Arizona desert and the Alaskan arctic. Part III compares test profiles based on excluding benign environmental phases with profiles that include benign stress conditions.

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