MEXICAN WAR FATIGUE HAT
1854 - 1861
1859 US Army Regulations
1491. For companies of Artillery equipped as Light Artillery, the old pattern uniform cap, with red horsehair plume, cord and tassel.
1493. For fatigue purposes, forage caps, of pattern in the Quartermaster-General's office: dark blue cloth, with a welt of the same around the crown, and yellow metal letters in front to designate companies.
1494. Commissioned officers may wear forage caps of the same pattern, with the distinctive ornament of the corps and regiment in front.