It seems impossible for me to complete the Call to Arms mission. I thought I wasn't doing something right, but after looking at a walkthrough the final thing in the mission is to Retrieve the Deep Range transmitter from a fallen synth. The point on my map for the location of the transmitter is just under the floor. There seems to be no way for me to retrieve it. I assume the enemy dropped the item through the floor when it died.

Thank goodness for console commands. With the tcl command I was able to walk through the ground and retrieve it!