(NoVA)- If you’re traveling out of Reagan National Airport this weekend, don’t be alarmed if you see emergency personnel running through the airport. Officials say an emergency preparedness exercise will take place tomorrow. The simulated accident will give crews a chance to test their emergency response procedures. The airport says there will be a brief period where sirens, fire engines, and helicopters will be used, but the drill will be held in a remote area and will not affect flights.