Combined Information Data Network Exchange, or CIDNE, is a computer system used by the US military. It is used to collect tactical information from troops.How Manning Stole The Cables by Nick Dubaz on November 30, 2010, conflicthealth.com (website of Christopher Albon) retr Sep 2011
In 2010 US Army Private Chelsea Manning (then known as Bradley) was accused by the US government of giving out information from CIDNEI and CIDNEA (CIDNE Iraq and CIDNE Afghanistan) to people not entitled to receive it, in violation of various US laws (and, by inclusion, portions of the Uniform Code of Military Justice). Numerous media have reported that these are the documents contained in WikiLeaks' publication of Afghan War documents and Iraq war documents.
See also Real Time Regional Gateway United States v. Manning SIPRNet
References
The Wiki leak is more and less important than you think, Joshua Foust, PBS, July 26, 2010, retr Sep 2011
Polaris-Alpha, Polaris-Alpha, polarisalpha.com retr Jan 2020