Battleship movie Ending Spoiler

Do not watch this video unless you want to know how the movie ends! NASA discovers an extrasolar planet with conditions similar to Earth and transmits a powerful signal from a communications array in Hawaii. Meanwhile slacker Alex Hopper gets arrested while attempting to impress Samantha Shane, daughter of United States Pacific Fleet commander Admiral Terrance Shane. Stone Hopper, Alex’s older brother and a Commander under Terrance, is infuriated at Alex’s lack of motivation and forces Alex to join him in the United States Navy. By 2012, Alex is a lieutenant aboard the Arleigh Burke class destroyer USS John Paul Jones, while Stone is the commanding officer of USS Sampson. Alex is in a relationship with Samantha and due to disciplianry problems is in danger of being discharged from the navy. Their ships, along with others from around the world, are taking part in RIMPAC naval exercises in Hawaii. During the training exercise five alien spacecraft arrive in response to the NASA signal. Their communications ship crashes in Hong Kong due to an impact with a satellite along the way, while four others land in the water near Hawaii. Sampson, John Paul Jones, and the JMSDF Kongo class destroyer Myōkō investigate, but are trapped when one of the ships erects a force field around the Hawaiian islands. After shots are fired the aliens destroy Sampson and Myōkō, and damage John Paul Jones killing the commanding and executive officers. Meanwhile the alien flagship (with the force