Brown collar - Military personnel


Designation of workers by collar color
https://en.wikipedia.org/wiki/Designation_of_workers_by_collar_color

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Brown-Collar Worker - People working in Military services and Those who serve in the army like soldiers, army, navy, marines, air force, space force, and sometimes coast guard.


Types of Collar Workers! (updated)
https://www.linkedin.com/pulse/whats-types-collar-workers-hassan-choughari/