As in: “Article after article described the emerging cadre of black pilots and officers integrated into the army, air force, and navy units as the vanguard of integration elsewhere in American life” (Phillips, 2012, p.146).
Phillips, K. L. (2012). War! What is it good for?: Black freedom struggles & the U.S. military. Chapel Hill, NC: University of North Carolina Press.
For definitions of cadre, consult the Oxford English Dictionary.