Huh, I don't remember if binoculars can be buddy aided in CMBN or not. I'm fairly sure that radios can not. Actually, radios are assumed to be automatically picked up by squadmates if the radio operator goes down, even though this is oddly not shown in the UI (no radio is shown but the unit will maintain radio C2 links). So a radio can't really even be dropped unless the unit is wiped out to the last man.