just 1 quick idea - what about implement "tired-ness", tireness, after each mission ?
simply, after each mission each gals participated in just -finished mission, would suffer tired and exhausting, for some time.. ( -- dropping, decrease the energy, accurancies, morale, and amybe health too, and so on.. )
..and it would be dependably on mission time, longiness of mission duration :
long mission, - lots of hours = alot decreasing of energy, morale, (health, accurancy, etc..)
quick mission, - few (tens) minutes, till 1-2hours, at most = almost no decrease of energy, accurancy, morale..
--- double-posting is legal now, but let's keep it sane - Solar ---
´´´.. - aech gals, each person who was on that mission..