True, but the CIWS system, which includes the Sea Sparrow (not-so-affectionately called the Sea Chicken as a lot of those missiles either "hang fire" and fail to launch, or they fail to ignite the solid rocket propellant on firing and just get ejected off the launcher into the drink), has IFF (Identify Friend or Foe) capabilities which have to be manually overridden in order to shoot down a US/Ally aircraft. So, someone "screwed the pooch" bigly in this situation.