NRA underestimates the element of surprise, as D.C. Metro Police officer and a base officer are shot by unidentified gunman at the Washington Navy Yard,

The U.S. Navy said that three shots were fired around 8:20 a.m. at the Naval Sea Systems Command Headquarters building, where about 3,000 people work.
Rick Mason, a program management analyst who is a civilian with the U.S. Navy, told the Associated Press that a gunman was shooting from a fourth floor overlook in the hallway outside his office. He said the gunman was aiming at people in the building’s first floor cafeteria.
David Stevens, a Navy contractor, was on the phone talking in building 197 when he heard an initial volley of shots fired. He heard people shouting that a shooter was on the building’s fourth floor.
He said he ran to the edge of a glass atrium that overlooks all the floors and glanced up, only to hear a “second deluge” of shots. The fire alarm sounded, and people began exiting the building.
Stevens described the building as very secure. He said employees must present an ID at the entrances. Visitors must have security clearance to get in.
“It’s unbelievable that someone could get a rifle in there — if that’s what the shooter had,” he said.