They are out of radio contact. Look at the message at the bottom of the screen. Your unit AE2 IS in contact and can be used for indirect fire but if you click on AE3 and read the info at the bottom of the screen you will see this.........
when they regain radio contact you will be able to use them for indirect fire again
Don
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"You are never to old to rock and roll if you are too young to die".--- What do you expect to be doing when you are 80?