And, #3 gmv - even though it looks like a typical signature, but it is better made compared to others -- keeping it minimalistic, without too much effect, is sometimes better. I don't like the over-sharpening and over-blurring to bring a pseudo-dynamic effect.
I don't like the lettering. It's very bad in terms of font choice and location, but still does the job. I don't know that depicts the "War" concept.
#1 I would go easy with those effect and fractals, especially if you cannot pull them off nicely. The colour is too monotone; careful layer effects will make it appear more nice, but not this. The text is simply bad. I don't understand its size. Border destroys it.
I can see so much effort went on in making it, but without basic layering or effect knowledge, nothing goes nice. I can see the war in it, it's a warrior going hacking! I would have chose a subtle khaki/beige colour, though.
#2 I appreciate the concept, but it didn't pulled off right. The effects are playful, but it is not dynamic or dramatic enough. Not much of a sig, and has nothing that it indicates war, beside it being a for-female AK47
Anyway, nice job people.
(Oh, by dynamic, I mean the flow, focal, depth and lighting; by dramatic, the overall effects and concept)