Yeah, it seems really forced at some points. It's not bad, but there's a lot of room for improvement.
A really unsettling point is that there is neither rhythm, nor lack of it so much. You can write poems in a consistend rhyme scheme (abab, aabb, abba, whatever the fuck) and consistend meter, or you can send it all right of to hell and make it sort of twisting and shit. That can give it a more psychedelic feeling, which might even be a good thing for the topic of a soldier's broken mind here.
You picked neither; at some points it seems like you try to make it consistent, but you don't really manage. That's the worst one. My personal preference (as you can tell by my own poems) would be consistency and ordinary meters, yet I have no problem with some twisted stuff. However, you can tell if somebody tries to get consistency and fails which is probably what happened here.
Now, if you try to rewrite this, or at the next piece you write, if you try to make it inconsistent, still there are some rules.
Like repetitions. Work great when you're doing something inconsistent, reoccuring meters, rhyme schemes, phrases or lines. Like every so often, repeat something. If you go for overall consistency, that's not so important (only maybe concerning the repetition of catchy words and phrases) but with an intentionally fucked up meter and all that, it adds a lot to the poem.
Yeah, that. Also it's true that many rhymes seem forced. A rhyme doesn't always need to be words that sound really similar, it can also just be two words with almost similar meanings.
If you get all that down, work towards symbolism and metaphors and all that jazz.