Lonewolf, attrition level is something still present in (NATO) military operations. This has not changed because it is something inherent to the military. You could be tasked even for a suicide mision if the command decides it.
In the day to day life of military units the approach is as follows. They use risk matrices to determine the level of command required to give the green light. The more the risk level, the higher the level of the authority that can approve it. But no mission is theoretically "forbidden". The attrition level is something more implicit but still present.
Of course you train as much as you can in order to reduce the level of risk in any situation but accepting that any level of risk is acceptable if the president gives the order to go.