Those don't really mix well with BIS stock units though...
However, no AddOns needed at all, you just make the MP patch texture (and save it as *.pac or *.paa) and put it into your mission folder, then you select BIS stock soldier and put in it's init field (in the editor) the following 'code':
this setObjectTexture [0,"yourTextureName"]
Of course that makes the patch appear only on the arm of the soldier, but it's better than nothing..