military question

Tatthy
Hello ladies, I have a question for military wives...
When your partner/boyfriend want to have a "leave"/vacation... what is the process?? Are there fees involved with voluntary discharge?
And when going on leave, do they have to provide any type of information? Like flight number, address and name of person they will stay with? And also do the person they are staying with needs to help financially with the expenses of the trip?
And is Airfair re-enbursed? 
Sorry, so many questions...
Thank you all!