It is an unclassified federally-funded document -- as I understand things, it is therefore in the public domain.
Because many eyes often make bugs shallow, there is a pretty good chance that a public release of the code will find errors that both find funds that are owed to the government and exonerate people who have been incorrectly billed.
This can’t possibly be true, in general. Work products produced by a contractor from a federally-funded project are not automatically in the public domain. Government-held, unclassified data can be sensitive, proprietary, confidential, or contain private information about citizens. None of this is public domain.
Because many eyes often make bugs shallow, there is a pretty good chance that a public release of the code will find errors that both find funds that are owed to the government and exonerate people who have been incorrectly billed.
What better purpose for the American Fuzzy Lop?