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By Courtney Kube and Jon Schuppe

An Army training presentation on insider threats included Hillary Clinton among a rogue's gallery of killers and leakers, citing the former secretary of state as an example of "careless or disgruntled employees," NBC News confirmed on Tuesday.

The unclassified slide, which first emerged on a Facebook page that spoofs the military, was confirmed by a U.S. military officials, who said it was used as part of a lesson on how to secure classified materials and improve safety.

A spokesperson from the Army's Training and Doctrine Command said the slide was developed 18 months ago.

"As is common with Army training requirements, the local unit was given latitude to develop their own training products to accomplish the overall training objective," the spokesperson said in a statement.

"This particular presentation had not been reviewed or approved by the unit's leadership, and does not reflect the position of the Army. The training presentation has since been removed."

A U.S. military official told NBC News that the slide — with a header reading "Who is the threat? Insiders" — was used at at Fort Leonard Wood in Missouri.

Clinton's camp did not respond to NBC News requests for comment on the slide.

The mention of Clinton is an apparent reference to her use of a personal email server during her time at the State Department, including the handling of secret documents. FBI Director James Comey earlier this year described her workflow as "extremely careless."

Next to Clinton on the slide is a photograph of former CIA Director and retired Army Gen. David Petraeus, who pleaded guilty in 2012 to a misdemeanor charge of mishandling classified materials by sharing them with his former mistress and biographer.

Above them are pictures of Army Maj. Nidal Hasan, who killed 13 people in a 2009 gun rampage at Fort Hood, Texas; Chelsea Manning, a soldier who is serving a 35-year sentence in a military prison for sharing a trove of classified documents with WikiLeaks; Edward Snowden, a former National Security Agency contractor who has been living in exile since leaking classified documents on government surveillance; and Aaron Alexis, who killed 21 people in a shooting at the Washington Navy Yard in 2013.