Well  most covenant vehicles are named after spiritual beings. Same could go for the UNSC and animals. Aside from that naming military vehicles after animals is very common  in today's militarys. Raptor, Hornet, Tomcat, Eagle, Leopard, Tiger, Scorpion tank (not halo), Panther, etc. All of those have been used in todays military. And thats not even half of the names i bet.

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Chuck Norris had the cajones to join the Angels of Death....do you? www.theaod.enjin.com
Must be 1000+ years of age to join.