I respect and sympathize with your thoughts and feelings and opinion here, I really do. While one person may find a demonstration toned at an appropriate way, it could seem offensive to someone else. I think that is applicable to most forms of demonstration.
However, I have to say, because I am a firm believer in the Noam Chomsky philosophy that freedom of speech means EVERYONE has the right to freedom of speech, that they should just have the right to demonstrate what they want to. Noam believes even the most outrageous, or crazy citizens of the world, whose opinions are unthinkable or inconceivable, have the right to say what they want.
With that said, if you feel offended by this, or some of your peers do likewise, you have every right to protest. Don't be silent, let them know your concern. You have the right to make a counter response! Just be respectful and reasonable when you do so.
Personally, judging by the description of this demonstration, I wouldn't be offended. I don't think this is in any way demoralizing our young men and women in uniform, and is rather doing the opposite. It is trying to strike an aesthetic response to everyone, "...never again!". Never again should our young men and women have to experience the horrors of sensless wars like these and the numbers won't keep adding up in loss.
I believe you CAN do both, in protesting the war and mourning the dead. War hurts. War scars. War kills. And I don't believe anyone should be hurt, scarred, or killed this way. I don't believe in war, which terrorizes whole communities like that.
But, of course, that's just another opinion.
If many more agree with you and are offended by this, then perhaps you can convince the organizers to have their demonstration elsewhere or consider an alternative way of symbolizing the losses. Otherwise, I say just be respectful and let them be as long as it needs to take.
"You'll find something that's enough to keep you
But if the bright lights don't receive you
You should turn yourself around and come back home" MB20