When they were launching the nuclear warship: The first boom got them off the ground, the second one was the proof of concept that allowed the ship to to actually fly and fight.
100 posted on 03/01/2016 9:04:53 AM PST by Don W
( When blacks riot, neighborhoods and cities burn. When whites riot, nations and continents burn.)
102 posted on 03/01/2016 9:15:20 AM PST by Toddsterpatriot
("Telling the government to lower trade barriers to zero...is government interference" central_va)