Since the very early 1980s, various government agencies have increasingly issued requests to depository libraries directly or through the Government Printing Office (GPO) to destroy or return certain distributed documents. This article cites recalled documents and explores the reasons for their recall. Most recalls fall into one of five problem categories: military security, administrative and operational security, falsified data, outright censorship, and environmental security. Specific reasons for recall are seldom given and must be inferred by examining specific titles. Librarians have shown little published interest in the subject of recalls, but an informal survey indicated general compliance with the recall requests. The GPO also has said little except to ask agencies to direct the recalls through the federal Depository Library Program. It is concluded that the GPO should take a more active role in reviewing agencies' requests, since many recall requests have been of doubtful value, and that government documents librarians should assess recalls on a case-by-case basis.