From: Santa Rosa, CA
Lack of required troops can cause loss of VPs, loss of Admin points, and/or speed up in future events in the same theater. Events can change level of combat in a Theater Box (TB), which impacts losses to the units in that TB. So if you don't garrison Western Europe adequately, D-Day will likely come sooner, and once D-day happens, combat and losses dramatically increase. Similar things going on in Italy and North Africa. We expect to have 2 ways to play the game, one where TBs are not under player control and movement of units between fronts is also not under player control. The other where players have limited control (limited in that you can't transfer units out if you fall under a minimum in the TB, and it will cost some APs to change a unit's transfer schedule). Still in alpha so still working on a lot of the details, but that's the basic outline.
All understanding comes after the fact.
-- Soren Kierkegaard