Dropped Third Strike or not?

[NavyCoach]

Dropped third strike or not? The pitcher throws a pitch that bounces. The batter swing and missing for the third strike. No runner on first. The catcher catches the ball after the bounce. Is this a dropped third strike? What I had been told is that the catcher has to have an opportunity to catch the ball, so no it is not a dropped third strike. In the last game we played, I was told that anytime the ball hits the ground on the third strike it is a dropped third strike.