I wonder if Chise can heal faster than a normal human in the likes of Captain America (despite her need to wear bandages over her wounds), since he was also modified to become a weapon by the military.
So her code word for missions is the English word "job".
In Japanese, to say "[be] okay" is "daijoubu".
Chise's missions are dangerous and she could lose her life out there on the battlefield, so I guess they can be called "die-job".
... I'll leave now.