The North American Aerospace Defense Command is planning a training exercise over the Washington area intended to test its ability to spot gyrocopters and ultralight aircraft.
Sunday's exercise comes about four months after a Florida man piloted a gyrocopter through restricted airspace to land on the West Lawn of the U.S. Capitol.
Douglas Hughes said his flight was intended to call attention to the influence of big money in politics. He faces a range of charges.
NORAD said its exercise is based on that incident but will involve four aircraft. It won't be attempting to intercept the aircraft Sunday, NORAD said. The exercise will test its ability to identify and track low altitude, slow speed aircraft.
The flights are scheduled for two intervals between 9 a.m. and 11 a.m.
