You should be able to obtain his service record file through the service noted in the Red enclosed box above.

George Martin

Silas Wilson enlisted as a Sergeant in Company F, 136th USCT

UNITED STATES COLORED TROOPS.
136th REGIMENT INFANTRY.

Organized at Atlanta, Ga., July 15, 1865. Duty in Dept. of Georgia.
Mustered out January 4, 1866.

Frederick A. Dyer "A Compendium of the War of the Rebellion" vol. 3