Tom Cruise honored his late 'Top Gun' costar, Val Kilmer, during a speech at CinemaCon.Cruise called for a moment of silence to honor Kilmer, who died on Tuesday at the age of 65.Cruise expressed admiration for Kilmer's work and called him a great human being.Kilmer played Tom 'Iceman' Kazansky in the 'Top Gun' films and returned for the sequel 'Top Gun: Maverick.'