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.
The RDA for boys aged 14 years to 18 years is 900 micrograms, whereas for girls in the same age group, the RDA is 700 micrograms. Adult men aged 19 and older should consume 900 micrograms of vitamin A per day. The daily requirement of the vitamin for adult women aged 19 and older is 700 micrograms.