IIRC there are three different HE SM strips, not counting the two different command strips. This is the common format for the infantry units in the original armies, 3-4 different R&F strips and two or sometimes three command strips. Its only really towards the end of the Fanatic releases that you saw the in-unit variety reduce to two strips and only one command. In the DE's they added the potential for variety by making the strips divisible, so that you could mix strips up a bit.