In 1958 the Army added two grades to the NCO ranks. With the addition of these grades, the ranks of the NCO were corporal, sergeant, staff sergeant, sergeant first class, master sergeant and sergeant major.
DRI is the general term for a set of reference values used to plan and assess nutrient intakes of healthy people. These values, which vary by age and gender, include: Recommended Dietary Allowance (RDA): average daily level of intake sufficient to meet the nutrient requirements of nearly all (97%-98%) healthy people.
Recommended Daily Intakes and Upper Limits for Common Nutrients. Sources: Dietary Reference Intakes (DRIs): Recommended Dietary Allowances and Adequate Intakes From the National Academies (Figures for infants also available.); Daily Values from FDA Food Labeling: Revision of the Nutrition and Supplement Facts Labels 2016.