Martha Raddatz reports on board a U.S. Navy ballistic missile submarine and explores how the most destructive warships ever built are helping keep Americans safe on “This Week.â€ÂÂ
SUBSCRIBE to ABC News: https://bit.ly/2vZb6yP
WATCH MORE on http://abcnews.go.com/
LIKE ABC News on FACEBOOK: https://www.facebook.com/abcnews
FOLLOW ABC News on TWITTER: https://twitter.com/abc
#ABCNews #ThisWeek #USNavy #BallisticMissiles