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June-August 2011: Agents in a unit responsible for patrolling the White House perimeter are yanked from their posts and assigned to protect the home of a personal friend of then-Director Mark Sullivan. Sullivan believed a neighbor was harassing his buddy. A top Secret Service officer sent agents to guard her home for several weeks. According to an inspector general's report, Sullivan knew of the move, though he has disputed this.* The reassignment isn't revealed until May 2014.
November 11, 2011: A gunman parks near the White House and fires at least seven bullets at the building. While Barack and Michelle Obama are not at home, their daughter Sasha and the first lady's mother are. The gunman, Oscar Ortega-Hernandez, is arrested, but as The Post reported in September 2014, the Secret Service badly botched the incident. Agents decided that shots had been crossfire from a gang fight and not aimed at the White House, and conducted only a cursory investigation. As a result, they only realized bullets had hit the building four days later, when a housekeeper noticed glass and cement inside that had been damaged.
April 23, 2012: The Post reports that about a dozen agents have been sent home from a presidential trip to Colombia for misconduct including hiring prostitutes—a semi-legal activity where it occurred, but one that is nevertheless banned for Secret Service agents.
May 2013: A supervisor in an elite Secret Service detail is caught trying to re-enter a woman's room at the Hay-Adams, a fancy Washington hotel, after mistakenly leaving a bullet there. During the course of an investigation, it emerges that he and another officer also both sent inappropriate messages to a female subordinate.
March 23, 2014: Three Secret Service agents are sent home from a presidential trip to the Netherlands after being found passed out drunk in a hotel hallway in Amsterdam.
September 16, 2014: Secret Service agents allow an armed security guard to be on an elevator with President Obama during a visit to the Centers for Disease Control in Atlanta—a violation of protocol. Agents became upset because the man was filming Obama on his cellphone; it was only later that they realized he was also carrying a gun. (Initial reports falsely stated that the man was a felon.) The incident does not become public for more than a week.
September 19, 2014: Omar Gonzalez, a knife-wielding Iraq War veteran, leaps over the White House fence, runs through the front door of the executive mansion (which was unlocked, counter to protocol), and moves through most of the bottom floor—passing a staircase with access to the presidential living quarters—before finally being apprehended by Secret Service agents. A front-door alarm had been muted, and several agents in Gonzalez's path failed to stop him. The full extent of his penetration into the White House does not emerge for several days.