Just to make sure I got this right.....  I am TDY for 100 days.  Lodging provided me a non-a for 4 days, then reserved me a room on base for remainder.   Sounds like I'm good to go for off base for the length of the TDY, correct?  Should I bother bringing up the JFTR and having them change my non-a from 4 days to 100?  
Also, I'll be on back to back orders.  After the first 100 day order, will I have to check out since they are separate order numbers?