If it’s not rule No. 1 about protesting, it should be: You gotta know the topic. Take yesterday’s talk on unmanned systems at the National Press Club. Participants included representatives from the Air Force’s RQ-4 Global Hawk program, U.S. Customs and Border Protection, iRobot and QinetiQ. The four talked mostly about more peaceful uses for drones, like helping the Japanese during the nuclear meltdown at the Fukushima nuclear power plant and providing aerial video of wildfires. As the panelists wrapped up their presentations and us news hacks in attendance prepared to ask inside-baseball questions about Global Hawk procurement, one of…