What would happen if North Korea launched a missile on America?

my husband is in S. Korea making sure that, that doesn't happen. n. korea does have some nuclear technologies. they will continue to test, and their crazy dictator will just become crazier. our defenses were high, and ready to fight, in case something would have happened. there are so many men and women over there, at our air force bases there, and navy bases that are protecting us. i'm not worried.... get some sleep tonight.