"E" is for enforcement I belive. But anyway my buddy, a Marine sationed on Mirimar, brings his Springfield HD .45acp home every time when on leave. He said it is pretty simple. They just put some kind of tamper proof security seal on the case and then he puts it in his checked baggage. And he flys to Iowa from CA about 2 times a year. He usually comes home for late muzzle,I mean Christmas\New years with the family(or so he tells his wife), And then bow season or "thankgiving with the family" or so he says. I think all in all he spends about 1 or 2 days with the family then it's off to the farm for a week. I think he has a very understanding wife.