After months of anguished debate over mass shootings, gun control and Second Amendment rights, the Justice Department finds itself on the defensive after a training manual surfaced that suggests federal agents could face a firing squad for leaking government secrets.

The online manual for the Bureau of Alcohol, Tobacco, Firearms and Explosives — complete with a photo of a turn-of-the-century firing squad — was obtained by The Washington Times from a concerned federal law enforcement official, and it immediately drew protests from watchdogs who said it showed a lack of sensitivity to gun violence and the continuing hostile environment toward whistleblowers.