I'm not in the Guard any longer. So information may be hard to retrieve. I did find this
http://www.fernblatt.net/m10.html#a1829
Without giving anything away, I did use one of the pieces of equipment listed here. Those familiar with voice comms may know the out dated ? piece I refer to.
Was trained in the 80's and Guard/Reserve units used these. Regular Army trained in a more advanced piece.
Found this
http://www.prc68.com/I/KY38.shtml
If this violates any rule please delete. I remember sighing some papers......