We force the men to stay, but they spread rumours among the others.

More and more of the men act like they are being held as slaves. The men no longer trust the officers. Stories begin to spread that government is performing some horrific experiment and we will all die. If this carries on we'll have a mutiny!
Should we let the angriest men leave? Or should we all go back - maybe they're right? Or should we use stricter discipline to force everyone in line? Or do something else?