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The minifigures and the guns will be custom made. There are a number of sites that offer custom printed minifigs in military uniforms, and Brick Arms is a good place to start if you're after specific weapons. The LEGO Group have a policy of not creating "realistic" weapons, although both fantasy and futuristic are acceptable.
You have (part of) set 5974 - Galactic Enforcer (2009). This set is missing a few parts, as the back end is supposed to be rather symmetrical and there is a separate space ship (black). See the picture below.
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