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This document is the primary American National Standard on application of the metric system. It emphasizes use of the International System of Units (SI), which is the modern, internationally accepted metric system. It includes information on SI, a limited list of units recognized for use with SI, and a list of conversion factors, together with general guidance on style and usage. It also lists older "metric" units that shall no longer be used. The word primary implies that other metric standards in the United States should be consistent with this document.

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1.1 This specification provides the format and guidelines for producing a catalog of current resources of air medical transport units, showing the patient care capability of each, in standard form.1.2 This specification applies to all the air transports involved in patient care that meet one or more applicable ASTM medical transport unit specifications.1.3 This specification incorporates only the information that is considered essential for use by the planners during an emergency. The intent is to provide information on what is available, what level of care it can provide, where it is, and the earliest it can respond, so that the most efficient use can be made of each unit, in accordance with the emergency plans.1.4 Information contained in the unit's operations manual, such as the weight and balance calculations for the "Specialized Medical Resources" listed in Appendix X1, is not included in the catalog but it will be available to the planners, on request.

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