They learned their lesson

Nope, any "immoral" decision in the US army has to be officially refuted before it can be ignored or disobeyed.

But that sort of defeats the purpose doesn't it?
And besides, who determines "immoral"?

The Uniform Code of Military Justice (The U.S.'s rules pertaining to how soldiers are to act) states that, yes, any unlawful or immoral order, as defined by the Geneva Convention, can be disregarded. In fact it is your duty to disobey such an order. (UCMJ) 809[890].ART.90 (20)