Seriously? I thought that development of the different tapes in both the EPAF MLU as the USAF CCIP chain happened in parrallel? At least from tape 4.2 onwards thats the case as far as I know.
Currently majority of both European MLU's as American CCIP's are equipped with the 5.2 tape which started to be incorporated from 2009 onwards. Tape 6.1 is being tested on different airframes starting in 2011 with in service date scheduled for somewhere in the latter part of 2012.