I very much doubt it vyper. It takes several hours to plan and execute an infiltration plan, and about 1 second to pull a trigger. The hostages would be dead before the SAS even entered the compound.
Kazan: well, since morality is the basis of all laws, it is absurd that something could be immoral but not illegal and vice versa. You're talking about Army rules governing combat, I'm talking about basic human morality. Soldiers are first and foremost human beings. This means that the imperitive to obey human morality should override the imperitive to obey orders. Not saying that it does, but it should.