Noncommissioned officers faced what types of challenges during the 1970s

The Non-Commissioned Officers faced racial violence and illegal drug use during the 1970’s or by the end of Vietnam War. More than 200 servicemen died because of drug overdoses during the war, 42 soldiers and 15 marines were killed from "fragging" attacks.

Moreover, by 1980’s the problem soldiers and the non-commissioned officers from the Vietnam War are dismissed within its ranks and the army began to impose discipline during the training.

we need the pie chart in order to

hi, according to my research the answer to the first question would be false. al tabari was the author of the first medical encyclopedia & he was a persian scholar not arab