[QUOTE=mlees]
You may not refuse a lawful order.
You cannot be ordered to commit suicide (“Sailor, I order you to slice open your wrists!”), but you can be ordered into mortal danger.
For example, let’s say a warship has been hit by some bomb/missile/torpedo, and is on fire. The fire is serious, and is threatening to set off the ammunition in the ship’s magazine.
A sailor can be ordered into the burning compartment, and activate the fire suppression system, and save the ship, even if that sailor may be seriously burned or killed by the fire or the suppression system.
In the movie K-19, which takes place on a nuclear powered submarine, the nuclear reactor springs a coolant leak. The captain orders the engineering crew into the reactor room to make repairs (and save the boat), even though the repair crew would be subjected to dangerous (in a few cases, lethal) dose of radiation. This movie is based on real events: K19 - Wikipedia
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I actually like that movie–it does take place in the Soviet Union though, some years ago. There were definitely different standards of behavior in the Soviet military than in the U.S. military.
However, it is a pretty common military doctrine that you can be ordered into mortal danger. If that wasn’t the case, it’d be nigh-impossible to conduct war. (While it might be nice if it was impossible to conduct war, unfortunately not every country is going to agree never to put soldiers in mortal danger.)
Gross negligence on behalf of an officer can have consequences, but there is a great deal of leeway given, and it’s rarely going to be acceptable for someone to disobey a direct order to advance on/engage the enemy just because the individual soldier thinks it is too dangerous. It is not the job of enlisted men to decide whether or not they will attack when they are given a direct order by a superior to do so, they do it, period.
The naval example is pretty good, too–there are many instances in naval history in which a commander may have to issue orders which he knows will almost certainly kill some of his men, in order to insure the entire ship wasn’t loss (which would mean loss of almost the entire crew and of course the vessel.)
In the modern era it’s probably a bit more survivable to abandon ship if you can–life vests, life boats, rescue helicopters and et cetera. In the Age of Sail though abandoning ship in the wrong place was pretty much guaranteed death for all.