battle damage vs combat casualty

battle damage and combat casualty both are nouns.

Word	Noun	Adjective	Verb	Adverb
battle damage	Yes	No	No	No
combat casualty	Yes	No	No	No

As nouns, battle damage and combat casualty are synonyms defined as:

battle damage (noun)	combat casualty (noun)
loss of military equipment in battle	loss of military equipment in battle