Guys I am having the same issue getting the peacekeeper onto all 4 of my accounts. So what I did was, log into call of duty elite under one of the accounts THAT IS NOT my primary account. Then went to the primary accounts custom classes. I clicked copy class and it took me back to my class section and I pasted it it into the non primary account class and it worked. I have yet to log into my xbox to see if it was there but it said it copied succesfully!!
lemme know if it works. I cant log into xbox live right now they say there is a problem and they are fixing it....thanks microsoft