So how does a new guy use this information to pick which base they want to be at. My goals would be to fly as much as possible at any base until I can hold a line in CLT if I'm not already in CLT.

I take it R1 is Round 1 line holder and that means that the date on the graphic = the lowest seniority to hold that position ?

I have no idea what Bu is, I'm guessing LCR and SCR are long call and short call reserve. Again, I'm assuming these are the lowest seniority to hold this position ?