Not sure why they allowed their prized ships to be destroyed by some dumb pegs or was there a technical reason? I was sort fo waiting for their other defence weapons which never came when I was watching the film.

http://www.bloomberg.com/news/articles/2012-05-18/navy-wanted-slimmer-sailor-for-role-in-battleship-movie

“Battleship “is an adventure film” not meant to be taken literally, Berg said. Still, Navy consultants were involved with how to portray procedures, such as “the way the Navy communicates, certainly wardrobe and cause-and-effect -- if some member acts out, he’s got to be held accountable,” Berg said. “That was no problem.””