(AP) — The North American Aerospace Defense Command is conducting an air exercise over Colorado and Kansas.

Officials say residents in an area between Hugo, Colo., and Garden City, Kan., may see F-16 fighter jets or Learjet planes participating in the exercise Tuesday afternoon.

The exercise, called Felix Hawk, is designed to test the rapid-response capability of NORAD’s Western Air Defense Sector.

NORAD is a joint U.S.-Canada command responsible for defending the skies over both nations and monitoring sea approaches. Its headquarters are at Peterson Air Force Base in Colorado Springs, Colo.