60
Protecting the skies over North America is a joint effort between the United States & Canada. These two great nations have stood united for over half a century. This year, NORAD celebrates its 60th Anniversary. #MayTheFourthBeWithYou #NORAD60 #WeHaveTheWatch pic.twitter.com/jtskXL5sMS
— NORAD & USNORTHCOM (@Norad_Northcom) May 4, 2018