A billboard placed inside the Washington Metrorail system's Pentagon stop encourages Defense Department employees to leak classified information.
"Snowden Honored His Oath. Honor Yours!" the paid advertisement says. "Stop Big Brother! Expose Unconstitutional Actions."
The ad is paid for by Oath Keepers, which describes itself as a Constitution-defending association of current and former military employees, police officers and first responders.
"We will also be placing that sign and similar signs as close as we can get to the NSA headquarters" in Fort Meade, Md., and near the CIA headquarters in Langley, Va., Oath Keepers founder Stewart Rhodes told U.S. News.
The Washington, D.C., headquarters of the FBI and the Department of Homeland Security are also on the to-do list.
"We have a billboard showing the signing of the Declaration of Independence and talking about Snowden that we will use next," he said.
Perhaps predictably, not everyone is pleased with the ad campaign.
One man interviewed by WJLA-TV near the Pentagon stop angrily muttered, "he should be crucified," referring to former NSA contractor Edward Snowden, who last month exposed massive Internet and phone surveillance programs operated by the government. The man also objected to leaking information deemed classified by any other country.
Rhodes tells U.S. News his group has already lost one member because of the ads. The member, a former NSA employee, "loves Big Brother, after all," he quipped.
What some Metro riders had to say: