The noun combat can be countable or uncountable. In more general, commonly used, contexts, the plural form will also be combat. However, in more specific contexts, the plural form can also be combats e.g. in reference to various types of combats or a collection of combats.
What is the plural of battle?
1 battle /ˈbætl̟/ noun. plural battles.
Can the word it be plural?
The plural of “it” is, in fact, the word “they” in the subject case and “them” in the object case. ... Unlike the singular “it,” however, the plurals “they” and “them” can also be applied to people or objects with names, not just inanimate objects.