More than a month ago, the team of twenty left the Last Bastion. The weakest among them was low Rank-6, and the highest was peak Rank-7.
The fort commander has already made them understand that this mission might be a suicide mission. The chances of them returning alive would be very low. So, everyone who went did so voluntarily.
More than half of them were military.
They are someone who has already prepared for death. So, they didn't back down even when they learned that this could be their last mission. This was something they signed up for a long time ago.
Moreover, they knew that the higher-ups wouldn't send them to death missions unless it was so important that it couldn't be ignored.
Missions like that are usually what could cause major turmoil in society. So, even the fort commander didn't say much, even though he himself was in the dark about this mission.