Is your feature request related to a problem?
No.
Solution you'd like:
When you put the "Add flashlight module" on a unit or a group their night vision goggles should be automatically removed. There's no reason for the unit to use flashlight if they still possess NVG.
Alternatives you've considered:
You can remove the NVGs in "arsenal" but the process is very tedious because you have to do it for each individual unit if there's a big group.