I've refused to pick up cig butts as well. I told them I will pick up anything else, even the old cardboard boxes bums sleep in out in our parking lot when we are not at drill, but cig butts no way.
Our platoon leader in Iraq wanted to check out an IED we found (looked to be some plastic explosives in a coffee can) He didn't think it was real, so he wanted to go look at it from arms length away, and wanted my team to drive down with him in the Humvee. We refused saying it was the dumbest idea we have ever heard (and it still is) and we got into a big screaming match right there on the side of the highway. We got on the radio, and our company commander starts screaming at him along with us on the radio. Finally, since the captain said no, he shut up about it but got all moody about it, like a little kid.
EOD arrived, and it was two pounds of C4 in a coffee can, with detonator and wire attached. We followed the wire but there was no one on the other end.