When I went in I had to sell off my entire collection of everything. I tried to set it up for someone to house them and can maintain breeding plans but keep 80% profit made from clutches...but I decided that it is honestly best to sell them all and start over once your out. I am glad I made that decision, although it sucks really bad starting from scratch again. I was only in 4 years but managed to do 3 deployments and most my time back was spent in sniper school or other training available. Just sell them off, unless you have 100% trust in a friend or someone to keep and maintain your collection for you.
What MOS are you looking to get?...if you know yet.