(3) Proper coordination is made before unit CPs move.
(4) COMSEC keys and frequencies are distributed.
(5) Subscriber problems are accurately identified.
(6) Troubleshooting is a coordinated effort between the signal officer and MSE network
Summary. In this lesson, you learned about the communication systems that a divisional air
defense battalion establishes. These systems consist of internal single-channel radio nets, internal wire
systems, external radio single-channel radio communications, and external multichannel radio
communications. An air defense battalion accesses the MSE network through a small extension node
(SEN). Mobile subscribers access the MSE network through a mobile subscriber radiotelephone