I have a gut feeling that some succesors to WWII legacy will in future conflicts use the (Mass Effect)Turian-like merciless tactics and brutal methodology.
Like : "Central command issues order to create safe-zones-Y for combat-zone-Y(part of the front, part of a city) from xx-1day date to xx-0days0sec for any enemy "personel" to evacuate. They wil be informed by the means of radio or means A or B of its existance. They will be disarmed,not harmed in any way and given non-weaponazeable suplies the moment the countdown ends, if they chose to surrender peacefuly inside the boundries of safe-zone-Y.
After the countdown ends ANY personel remaining within combat-zone-Y is to be ELIMINATED."
Without mercy
, everybody, the entire Y-zone will be DEVOID of ANY SENTIENT LIFE, by any means necessary bare the usage of planetary ecology damaging-WMDs.
The Turians don´t reckognize civilians, only combatants(soldiers) and non-combatants(techies, medical personel, ... but all capeable and trained to wield wepaons)