Generally this term appeared in US military force.It is set of documents maintained by the US government for members of the United States armed forces. 201 files usually contain documents describing the member's military and civilian education history. A 201 file may also contain personal information such as home of record, and awards documents. Typically, a 201 file contains one or more of the following
Promotion Orders,Mobilization Orders,Service School Academic Evaluation Reports
Awards,Transcripts etc
Regards
DN