Comment by TeMPOraL

Also even if they know you are transmitting, it may still be beneficial to prevent them from knowing how much you are transmitting.

Imagine the enemy detects some of your transmission, even knowing it's encrypted, they can still look at the data rate (or estimate order of it):

- 5 bps = probably a random transmitter, maybe audio spy device, maybe remote detonated weapon

- 5 Mbps = probably a feed from military hardware or personnel

Similar inferences can be made about volume, if they can identify distinct transmissions. Etc. If tricks like these can make the enemy confuse 5 Mbps TX for a 5 bps one, it has obvious tactical utility.