OP,

Have you considered the position of the dependents in the military? It doesn't matter if they signed disclosure statements or not. They all have moms and dads, brothers and sisters, aunts and uncles etc etc. There's no way they wouldn't warn their families and friends.

From my point of view, the military has nothing to gain by pre-warning dependents but everything to lose by opening their mouths. Upon getting deployment orders, the soldiers could simply be told their families will be mobilized and moved to safe locations. Most of them would buy it.