I kid you not. The surprise ending is meant to comment on a bizarre political trend in the last third of the 20th Century in which military putsch leaders seemed to be of ever decreasing rank. The nadir of this phenomena being the 1980 Liberian coup which left MASTER SERGEANT Samuel K. Doe as head of state.
At the climax of this film the lowly soldiers stationed as guards at Red Island turn out to be part of the movement to overthrow their country's military dictator and replace him with one of their own. But, surprise, Red Island's sub-commander reveals during the denouement that he's already cut a deal with the regular military to depose and succeed his comrade within a fortnight.
Oh-ho! Sex AND Politics? That's the SEVENTIES for you.
(should also mention that the chicks were totally smoking)
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