Documents relating to service in the Polish Army deserve special attention. Many families do not consider such materials as a possible source of evidence, but in practice, they often contain information about a person's nationality, citizenship, place of birth, parents, and other life circumstances.
Depending on the period of service, such documents may include:- information on nationality;
- information on citizenship;
- place of birth and residence;
- information on parents and family members;
- information on military service.
The materials stored in Polish military archives are particularly valuable. The most well-known specialized institution is the Central Archives of Poland (Centralne Archiwum Wojskowe, or the Central Military Archives of Poland). It is here that it is often possible to find documents that help confirm the Polish origin of ancestors and supplement the evidence base for research.
In many cases, the search must be conducted simultaneously in several archival avenues, since it is impossible to determine in advance which document may contain the necessary entry about a relative's Polish nationality.