Top US military officer: 'We let the boss down' over prostitute scandal Members of the Secret Service have been accused of hiring prostitutes ahead of President Obama's trip to Columbia. As many as 20 agents may be involved, and the president is calling for a thorough investigation. NBC National Investigative Correspondent Michael Isikoff has the latest details in the case. Army Gen. Martin Dempsey, chairman of the Joint Chiefs of Staff, has admitted, "We let the boss down" over allegations of misconduct involving prostitutes against at least 10 U.S. military members at a Colombia hotel on the eve of President Barack Obama's visit over the weekend. Dempsey, the top U.S. military officer, told a Pentagon news conference Monday that the leadership of the armed forces were embarrassed by claims, according to a report by The Associated Press. He said he regretted that the scandal had diverted attention from Obama's diplomacy at a Latin America summit. "I can speak for myself and my fellow chiefs: We're embarrassed by what occurred in Colombia, though we're not sure exactly what it is," Dempsey added, according to the report. Former Secret Service agent Dan Bongino, who worked in the presidential protection division, shares his view of the scandal involving at least 11 Secret Service personnel and more than 5 military personnel. Pentagon press secretary George Little said that the military members who are being investigated were assigned to support the Secret Service in preparation for Obama's official visit to Cartagena. He said they were not directly involved in presidential security. Agents in prostitution scandal had president's schedule in rooms The Secret Service sent 11 of its members - including agents and uniformed officers - home from Colombia amid the allegations. Locals told Reuters that the Americans had been to a brothel on the outskirts of Cartagena before bringing women back to an upscale beachfront hotel near where Obama was due to stay when he arrived the following day. ABC News reported that the brothel was called the Pley Club. It reported that an unnamed bouncer and a police source said the men were drinking heavily and then "enlisted" the club's prostitutes.