Yes, it is.
ced381 can decide whether or not he wants to respond to your question, but for future reference don’t ask such questions of veterans of any war in a public forum and especially not on this one, nor privately if you have any sense or sensitivity and, in some extreme cases, don’t want a kick in your balls for an answer.
The fact that I had to say that shows that it would be pointless to try to explain to you why you shouldn’t do it. Just accept the advice; follow it; and wait until you have acquired enough understanding of life to know why you shouldn’t do it. And then you won’t.
But, for the time being, just try to grasp this: being shot at, shelled, or bombed; being wounded or killed; having your mates wounded or killed; shooting at other people; and wounding or killing them is not ‘cool’.
Don’t make the mistake of reducing any experience of war to an idiotic term like ‘cool’, because it is anything but ‘cool’.