CAPE CANAVERAL, Fla. - The first SpaceX Falcon Heavy rocket to launch in three years soared above a thick blanket of fog Tuesday morning sending a top-secret U.S. national security mission to space.

Remember the first time you saw a SpaceX rocket nail a bullseye landing after hurtling back from space? How about the first time two boosters landed side by side, punctuating the inaugural launch of ...