In the original novel, the armed forces of Costa Rica play a key role in the end of the story, both rescuing and holding the surviving characters and bombing the island and the dinosaurs into oblivion. Filmmakers decided against this idea for budgetary reasons and to remain open the possibility of any sequels but, interestingly, this is also a mistake by author Michael Crichton himself, since Costa Rica hasn't had a military force since 1948.