APO/FPO/DPO address

Rarely do I encounter a need for this feature, but working with more online orders and gifts going to other parts of the world, links from Pinterest for example ask if I ship to APO/FPO/DPO addresses, I was wondering if a special ship to address could be added to allow a buyer to select APO/FPO/DPO as the address location and then fill in the appropriate information of which they in theory know better than I.  If they use the normal ship to address the system I believe requires certain fields and if not entered the system does not let the user by.  I am simply trying to put the responsibility onto the buyer and off of me for when they want to ship to a military or diplomat outside the US.  I hope this makes sense, if not send me a note and I will try and explain further.