The uplink, downlink to an AWACS (a few years ago at least) was not encrypted well either.
A little bird whispered in my ear years ago about a young lieutenant who uploaded a simple virus and brought a joint military operation to a standstill because of it to make his point about security.
The little bird is not in the Army now...
...and the feeds still aren't encrypted.
A very close friend works in data security. It's an area frequently overlooked and considered unimportant. I suspect it'll take a big hit to get anyones attention.