The Lightship (1985)

Just when US Coast Guard captain Miller takes his teenage son Alex to his lightship off the coast of Virginia, Calvin Caspary and two criminal accomplices, on the run for the police, decide to hijack it. What the crazy trio didn't count on is that this small crew doesn't just keep taking it lying low, they will put up a fight. Alex hides dad's gun and wrestles his his war past and courage.