I've made a plugin to stop certain player entities taking damage but i want the heli excluded from the list. I've managed to allow the minigun to inflict damage with:
if (!(info?.Initiator is BaseHelicopter))
{
        //cancel damage
} 

but it doesn't catch the rockets.
Any help is appreciated and thanks in advance.

if (info.WeaponPrefab.ShortPrefabName == "rocket_heli")

Absolute legend, thank you very much.

don't forget to check if WeaponPrefab is null before checking its ShortPrefabName