NORAD's 50th anniversary is being marked with events, memorabilia and contests

• AirVenture, Oshkosh, Wisc. www.airventure.org, July 28 to Aug. 3

• Historical displays at airports in Colorado Springs and Panama City, Fla., and planned for airports in Winnipeg and Ottawa, Canada, and Anchorage, Alaska.

• Gift items bearing the NORAD logo.

• Essay, anecdote and photo contests. For winners and other information go to www.norad.mil/50/