Those who served in the 67th Regiment, New York Infantry (volunteer, union) in the American Civil War are indexed as derivative record. For example, the one for Vincent Valentine states that he was in company “C”, though his rank was not recorded. The original record is described as being located on film number M551 ROLL 143 (which is housed at NARA); a general note states that it is filed under Valentine/Vincent.
A description of the 67th Regiment, New York Infantry is linked from the record, which has extensive information about when and where the unit was organized (Brooklyn, NY in 1861), as well as the details of the brigades and divisions they joined, and the details of its service, including battles names and dates. The number of officers and enlisted men who were wounded, killed, or died of disease was indicated, however, I’m not sure if it accounts for volunteers who perished. A link from this page leads to a list of soldiers that served in the 67th Regiment, New York Infantry, which is searchable (parameters are listed below).
The website used to locate this information is operated by the National Park Service, which was accessed through NARA.gov. It is an interesting collaboration, which makes sense due to the popular interest in Civil War re-enactments that often take place in national parks. Included on the main page are other searchable databases pertaining to the Civil War, including sailors, regiments, cemeteries, battles, prisoners, medals of honor and monuments. Searches parameters include name (first/last), side (Union/Confederacy), battle unit name, and/or battle unit function, which interestingly included engineers and musicians!
Original service records for soldiers (including volunteers) were generated from muster rolls, which were used to record each soldier’s name at the company level. Later, in the 1880s, the records were indexed to determine pension eligibility. Historians calculated that approximately 3.5 million soldiers (including volunteers) fought in the war, although there were 140 million General Index Cards created, also located through NARA.gov, along with the original muster rolls, as well as the finding aid for this, and other, units, although they are not detailed. The original record , however, is not available to view.