Greetings Civil War Researcher's:
The NY Public Library's webpage entitled. "USSC Civil War Soldiers Inquiry Database" includes records of the USCT.
In its introduction, NYPL describes the page as:
The United States Sanitary Commission's Hospital Directory collected and recorded information concerning the location of sick, wounded and missing soldiers for the benefit of their families and friends. The Washington Hospital Directory Archives records contain over 9,000 inquiry files dating from 1862-1865 concerning soldiers and other individuals. Although most of the files refer to state volunteer soldiers, there are also inquiries for U.S. Army regulars, U.S. Colored Troops, Navy and Marine servicemen, Confederates, government and USSC employees, hospital staff and civilians."
If you plug in "colored" into the search engine, the results will include people of color who served in the Union Army but were not soldiers. One person was Mary Ballard who served as a stewardess on a steamer.
Bennie I found a Michael Mooney who was an engineer in the 98th USCT. Is this one of the units that we discussed?
Enjoy researching these files.
K Wyer Lane