You know what, if you are against war (and I am, fwiw) then aim your protests at the right people - the government! They send the soldiers in. They decide. They are responsible. We do not and we CANNOT have armed forces or members of armed forces who say nah, we won't go there, or yeah, we're coming home now, or yes ok, we'll fight this one. Can you imagine? And we NEED armed forces (sadly), let's not be foolish enough to pretend otherwise.
So protest, yes - but aim it in the right direction.
You know what though - if the people who declared war, or decided to take it upon themselves to sort out another country, were the people who actually had to go there and fight themselves...there'd be no wars ever. It's much easier to send someone else out to risk their life.