1950 science fiction movie on an island base

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Okay Hive Mind: I’m trying to identify a (I think SF) movie that had the following elements:
black and white
1950s
takes place on an island Army/Navy base
there’s a dog
there’s a doofus Private who loves the dog and then gets murdered
there’s a hero planning to leave real soon
Based on a (minor) novel

Any ideas?

Answered question

Can we rule out The Proud and Profane (1956)?
https://www.youtube.com/watch?v=sbYYFnsQwIU

And Five on a Treasure Island (1957)?
https://www.youtube.com/watch?v=cKLZAkrqH5o