question re: tour lengths for billets

[notdeadyet]

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Looking over the BUPERS website, I noticed that for tour lengths of billets, they often show two lengths for each billet (36/12, 36/24, etc.). I realize that this is the nubmer of months, but what do the two numbers represent?

Example:
http://www.persnet.navy.mil/pers4415/Medical_Corps_family_practice_billets.htm

 

[trixmd]

accompanied/unaccompanied
accompanied with with your spouse and/or children
unaccompanied is just you

 

[notdeadyet]

accompanied/unaccompanied
accompanied with with your spouse and/or children
unaccompanied is just you

Thanks, Trix. That makes sense...