How do I get machine guns in the Japanese bunkers on Iwo Jima in Battlefield 1942?

On the map Iwo Jima in Battlefield 1942, there are boxes and bunkers but no machine guns (japanese bunkers). Why? And how do I add them?How do I get machine guns in the Japanese bunkers on Iwo Jima in Battlefield 1942?
In the single or in the multiplayer? You can add your own guns in the maps using battlecraft 1942.

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