So..... lots of problems in your files...
First, you've put the texture in the second texture cannel instead of the first... Second channel is for added effects and looks good only when a first one is present.
Second, You haven't set texture coordinates for the model. You should unwarp your model to make a texture perfectly set up for the model. You can use a generic texture for tests like here, but don't forget to set up texture coordinates anyway. The texture doesn't "know" how to be warped.
So, I can't really fix it for you but I can put generic texture coordinates on you tank to show you how to do it.
More, optimise your cylinders, you have redundant faces.... but you can wait until final work
Good luck
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