| Source: World War I: Biography and Service Records:
Persons Who Enlisted in St. Louis City and
County Location: Reading room / St. Louis shelves | |
 | |
| Last Name: | Koster |
| First Name: | Sylvester |
| Middle Name: | A. |
| Illustration: | No |
| Address: | 3638 Meramec St.; 3811 DeTonty St. |
| Rank: | Yeoman 1st class |
| Birth Year: | 1893 |
