How long after PCS date can I terminate my apartment contract and not lose my security deposit?

The easiest way would be to provide the apartment complex your wife's orders to give notice of PCS to break the lease.

YES and NO. Who's name is on the lease? If both, it shouldn't be a problem. If it is the spouse only, the spouse is the only one to break the lease. Most property management companies around a military installation are usually flexible with PCS moves [my only issue was with a private owned duplex]. If it is you only, you may have an issue. REMEMBER: Rule of Thumb: Your Security Deposit minus "carpet cleaning" fee" [which in my last apartment was $150].

This is a matter between you and the landlord. While there is usually a PCS clause in your rental contract, the most simple procedure is to discuss your situation with your landlord and make arrangements acceptable to you both. Understand during the discussion that you should allow an acceptable period for the landlord to find a new tenant.