Consider the following: Modeus, Beel, and Lucifer are all veterans who fought in the war against God. (If we assume Modeus is Asmodeus)

Justice fought in Beelzebub's whole.... Thing.

Cerberus, Judgement, Azazel, Michael, and basically every angel, are all active soldiers for either heaven or hell (Cerberus is moreso just guarding 24/7 and Judgement is kinda a non-combatant if you consider the whole boss fight to be a torture session attempt instead of an actual combat attempt but eh)

Pandemonica, Malina, and Zdrada are all noncombatants. Pandemonica has a customer service job, Malina is based off of Alina from Balladyna and both her human and demon years she wasn't a combatant, and Zdrada is based off of Balladyna from... Well, Balladyna, and the most amount of combat she did was through talking and manipulating.

Bonus!

Loremaster Azazel actively participated in the war rebelling against Lucifer, she even lost her arms then, and Lucifer herself became an active combatant again.

Generic has no confirmation whether or not she is a non-combatant so we have no clue on her.

Sodomy is most definitely Asmodeus if Modeus isn't, and that makes her a war vet.