In every mission involving the destruction of enemy ships, always take out the fighter escorts first. The ships look like "juicy" targets in the distance, but once enemy fighters get behind you, it is very difficult to shake off their missiles. In addition, on some missions you will run out of missiles designed to take out boats and must have to switch to guns. Take a high angle approach to the ship and wait until you are certain you can hit the ship with your guns (about 1000m). It takes about 200 to 250 bullets to destroy a ship.