That's actually a good point. Here's what I was thinking though. In order for the device to be able to receive, the device would need to be larger. The target transceivers will always be larger than this device, so hitting those would be a little easier.
As it is, it is simply too small. Someone sending a laser transmission from any range greater than 5 feet will need extra-ordinary accuracy to hit the transceiver of this device, and if you're talking about the device doing a talk back to itself to confirm the target it won't quite work either. If the device were at any angle other than perfectly parallel with the ground, its own confirmation transmission will bounce off of the receiver (or any other surface) and not back to the device. If the target isn't perfectly flat then the laser would be reflected at a different angle as well. As that is, there are just too many variables.
Simply put, this is the first part of a small communications kit. This part allows you to transmit (to larger targets such as power armor, or stationary targets that you know the location of). Another device, most likely a 4x4 inch pad that attaches to datapads will allow the operative to receive transmissions. So you are correct in believing there isn't a way to confirm that you're target has received the transmission.
As for X-Ray, that's a good point. Originally this was just an invisible laser, but X-Ray would be good for the reasons you suggested. And yes, packet compression (as well as encryption) is used. I should mention that.