Dog Comms
https://www.kvue.com/mobile/article/news/nation-world/us-military-dogs-now-have-their-own-mobile-blood-bank/507-6ce03cda-7696-4cc0-ad87-9bd765d24332
“The military has relied on "walking blood banks" for human casualties in Iraq and Afghanistan, where prescreened donors can be called up if there's an immediate need for blood in remote or deployed environments.”