I just watched a WWII movie called "Guadalcanal Diary". I didn't see a single canal in it! The whole thing was about fighting the Japanese on a small island in the Pacific. I am doubtful that there would even be a need for a canal on Guadal Island.
I'm sure this was quite a striking movie in 1943. Today it seems to contain every war movie cliche imagineable, but it might well be the movie that originated them so you have to give it a pass.