I recently had this thought while transferring personnel and equipment from one base to another: You should add a context-sensitive helpful display for the base being transferred to.
For instance, when the Equipment tab is selected, the screen would show the current capacity and inventory of the destination base; when the Employees tab is selected, the total / remaining capacity of the destination as well as the stats of the selected soldier; for the Aircraft tab, the hangar capacity; etc.
Also, I think that the method of reassigning soldiers in particular should be looked at more closely. The way the current system works, right now when I click on a soldier, it simply automatically assigns it to be transferred (if it isn't assigned to a vehicle) or warns me to unassign the soldier (if it is). I think that selecting a soldier in the menu should allow the player to view the soldier's stats and current status (Assigned / Idle), and the player should be able to then choose whether or not to mark the soldier for transfer (which will automatically unassign it if the player chooses to approve the transfer).
As it stands now, I'm having to constantly shuffle through menus to check whether or not the destination already has what it needs, if the soldiers I'm assigning are wounded / already assigned, etc. I believe that this sort of change would greatly simplify and streamline things.