Hi, you may be interested to hear about messenger/carrier pigeons, which have been used as messengers during times of war (and peace) for centuries. /u/Mike_Dash describes their usage in WWI in How effective and reliable were pigeons as means of communication in WWI? Is it possible to estimate how much was lost/miscommunicated in their use? How were they trained?.

And you may find this short comment by /u/PIGEON-POSTS-ONLY regarding British WWII pigeons of interest The Dickin Medal is "the highest award any animal can achieve while serving in military conflict" in the UK. Of the 69 animals awarded it, apparently 32 were WWII messenger pigeons. What did these pigeons do to justify their awards, and more importantly, was there a presentation ceremony?