You can make it even easier if you switch to a regex
test, and go for the negation:
awk '$3 !~ /^(NGS|RA)$/' file
Since the default action is to print, you can leave that off too.
And please use ***[code][/code]
*** tags around your code and data, to preserve the original formatting and to improve readability. Do not
use quote tags, bolding, colors, "start/end" lines, or other creative techniques.