I have but as a WO, I am an LE now. You will find working in a joint environment a challenging but rewarding time. I believe that in your post as SO3 J4 you will also have a SO2 and possibly a SO1. During TELIC they found it necessary to also have a Lt Col in charge of the branch. Read 'Lessons identified from TELIC 1 a LAND Perspective' (I think it is that is the title) You can find it on the DGD&D website on DII. It will give you a good insight on how it operated during TELIC 1.