If you think you've spotted low-flying black helicopters around Downtown Dallas in recent days, you likely have.



Twitter users reported seeing blacked-out helicopters flying in low, close formations with no lights.



Our partners at The Dallas Morning News checked and found out the helicopters were taking part in preparedness training for U.S. Special Forces Monday night.



The Morning News learned the training was necessary so that the they could get a feel for "realistic urban sites," according to the Dallas Police Department.



The training will take place for about two weeks in locations across North Texas, though officials aren't revealing where in order to keep people clear of the test areas.