Could you say more about this?
The mission builder has several choices on how a squad will behave:
One of:
- Stealth
- Combat
- Aware
- Safe
- Careless
These are probably self explanatory except the last two. Safe == standing up, gun on back, but will hit the deck when enemies are about; Careless == standing up, gun on back and will remain so whatever enemies there are nearby and whatever those enemies are doing.
and one of:
- Open fire, engage at will
- Open fire
- Hold fire, engage at will
- Hold fire
- Never fire
Without going into a detailed description: the engage at will bit involves them running off to target an enemy they are aware of in their usual AI way.
The default, unless the mission builder make a conscious decision to do something else, is Aware/Open fire, engage at will