I thought they did, from talking to some of the guys who were attached to my old unit. I just wasnt too sure maybe a currently serving American could shed some light a little more in detail.
I wouldnt do it to avoid customs, I was just saying for me to order a ule body from the U.S, most of the sellers wont send to the U.K. but if they have "U.S" postal address here in the UK, they may be more inclined to ship here.