548 Volumes of U.S. Navy Muster Rolls now digitized

USS Rattler from U.S. Naval Historical Center.

Volumes of 19th-century,1861 to 1879, US naval muster rolls are now digitized accessible to the public through the National Archives Catalog.  That's according to a NARA press release.
The muster roll data provide the names, birthplaces, ages, discharges, and physical description of enlisted seamen — and more.
At present, you need to know the name of the ship — search the catalog by ship name and the word muster.
A citizen volunteer transcription project is pending.