[Those living on the base pay no property taxes]

Hence, Federal Impact Aid. Been around for decades. This is an OLD, tired, worn "factoid", NOT a relevant fact, for reasons I have already stated above (and which you just wanna' ignore).

[The "in lieu" payments are less than what is spent per student.]

Again, you are just ignoring that K-12 per-student funding is shared by local, state and Federal entities. 

What you have grasped upon for dear life in this attempt to close the OLFare  old, tired, worn facts that are actually "factoids" and NOT relevant facts of any merit.