Combat Simulator is a special stage where you can send your girls in various simulator activity aka training. It requires Commander Level xx to be unlocked.
Performing simulations don't use ammo or rations but spends Energy which recovers every hour.
It has 3 categories, although originally it is once a simple version which was overhauled eventually. This simulators are open depending on the week with Sunday opens them all.
Experience Training =
Reinforcement Exercises =
Data Research =
Involves actual combat. You'll deploy Echelons at certain spots once before start of the combat. This cannot be paused once it started.
Once it is completed, you'll receive exp depending on the difficulty of the stage. This is eventually split evenly between all T-Dolls present in the simulation.
Involves on gathering combat data. Here you'll assign any girls against a dummy for 30 seconds. They can either available or doing Logistic Support.
Defeating the said dummy grants Training Data for Research, however it's high HP pool requires the Commander to experiment on formations and various girls to maximize damage output in less than 30 seconds.
The more advance this simulator is, the more tougher the dummy and gives a higher training data.