Greetings, R&R:
If you can get hold of IN SEARCH OF CHRISTIAN FREEDOM, check out chapter 8, Legalism - Opponent of Christian Freedom. Therein Ray Franz explains how a 'great body of "theocratic law"' has been built up over the years by the Society. You can read why one JW maid may clean a military man's home on a military base, but another JW maid cannot clean a base's barracks. Receiving pay from the military establishment itself would make the second maid unclean and liable to disfellowshiping, whereas the first maid receives her pay from a personal salary (hence, she would not become unclean).
Honest!
CoCo