By 1865:
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In 1864 the Uniform regulations gave the following for petty officers and crew. Not that much different than previously:
Boatswain's mates, gunner's mates, carpenter's mates, sailmakers' mates and ship's cook, will wear, embroidered in white silk, on the right sleeve of their blue jackets, above the elbow, in front, and eagle and anchor, of not more than three inches in length, with a star of one inch in diameter one inch above. The same device, embroidered in blue, to be worn on the sleeves of their white frocks in summer.
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All other petty officers, except officers's stewards, will wear the same device on their left sleeves.
The outside clothing for petty officers, firemen, and coal-heavers, seamen, ordinary seamen, landsmen and boys, for muster, shall consist of blue cloth jackets and trowsers, or blue woollen frocks; black hats; black silk neckerchiefs, and shoes, or boots in cold weather. In warm weather it shall consist of white frocks and trowsers; black or white hats, as the commander may for the occasion direct, having proper regard for the comfort of the crew; black silk neckerchiefs, and shoes; the collars and cuffs to be lined with blue cotton cloth, and stitched round with thread. Thick black cloth caps, without visors, may be worn by the crew at sea, except on holidays or at muster.
As regards recruiting, the regulations by the war's close noted no recruits were to be given a rating on enlistment. they were classed as either Fireman, Seaman, Ordinary Seaman, Landsman (no sea experience), or Boy.
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Landsmen and boys were frequently placed on a "receiving ship" in port to train them up before assigning them to a vessel for duty.