- Có t?i thi?u 02 n?m kinh nghi?m trong l?nh v?c quan tr?c môi tr??ng lao ??ng ho?c 05 n?m kinh nghi?m trong l?nh v?c y h?c d? phòng;Manufactured from blue wool with white, red, or buff facings, the frock coat grew to become the typical uniform for American officers by the tip with the war. The coats often featured elaborate gold or silver lace,