JC is right. I have never felt the ROE hindered any operation or mission. If you are shot at, shoot back, just hit what you aim at. During two tours, I have never seen a chain of command question the decision of a leader during any type of engagement. Never.
Also, ground troops are pretty much given the OK to fire in many non-standard cases, i.e., someone is laying in an IED. More often than not, units sometimes use too much force that wasn't necessary.