What branch was called the “backbone of the army”

Becoming the Backbone of the Army. FORT STEWART, Ga. Aca,!" A noncommissioned officer is known as "the backbone of the Army." According to WebMD, the backbone of any animal is the central support of the entire body.

the answer is typhoon

the difference is that white collar worker performs skills like worker as a scientist or well blue collars do physical work and they do services like being a cook.