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This is a 3743 - Technic, Gear Rack 1 x 4 and there are 2 times 2 of these in your picture (2 on the left and 2 on the right). I guess your description is a little vague, because if you are talking about the middle part (the shining light gray pieces), they are actually not bricks/tiles, but the axle end of an NXT motor (the right side of the motor in the ...
It is a Propeller 4 Blade 5 Diameter with Hole for Rotor Holder - used in 71 sets, but only in 5 in the yellow color you have. It was produced by LEGO until 1994, and would have fit on Plate 2x3 with Helicopter Rotor Holder. Together they would have made the rotor of a helicopter, such as in 1469-1 Helicopter Polybag.
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.
This piece is 42023pb005R - Slope, Curved 6 x 1 Inverted with Orange and Yellow Marbled Flames and 'G' Pattern Model Right Side (Sticker) - Set 8897, which is used in only 1 set: 8897 - Jagged Jaws Reef. But once more, please look at the Catalog Search function in BrickLink and spend some time learning it - this is the third consecutive "What is this ...
This is a Torso Overalls Blue Pattern (Dungarees) / White Arms / Yellow Hands, which is used in 48 sets and 16 minifigs. It was last produced by LEGO in 2005. I'd seriously recommend you make yourself familiar with BrickLink's Catalog Search feature and the LEGO naming standards as it helps you get these answers faster in the future, without having to rely ...
It's difficult to be certain due to the angle and quality of the image but I think they are these: Technic, Liftarm 1 x 3 Thick Item No: 32523 They are/were produced in many colours including both 'light bluish grey' and light grey'. More details on bricklink Edit Just realised you you referred to them as 'tile like bricks' so maybe it is this: ...
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