32 CFR § 22.530 - Metric system of measurement.
(a) Statutory requirement. The Metric Conversion Act of 1975, as amended by the Omnibus Trade and Competitiveness Act of 1988 (15 U.S.C. 205) and implemented by Executive Order 12770 (3 CFR, 1991 Comp., p. 343), states that:
(1) The metric system is the preferred measurement system for U.S. trade and commerce.
(2) The metric system of measurement will be used, to the extent economically feasible, in federal agencies' procurements, grants, and other business-related activities.
(3) Metric implementation shall not be required to the extent that such use is likely to cause significant inefficiencies or loss of markets to United States firms.
(b) Responsibilities. DoD Components shall ensure that the metric system is used, to the maximum extent practicable, in measurement-sensitive activities supported by programs that use grants and cooperative agreements, and in measurement-sensitive outputs of such programs.