In Svalarheima, Orcs are AVA 5 and have "Fireteam: Core" on their profile. In their notes, they say "Special Fireteam: Core - up to 2 Orc Troops can be part of a Fireteam: Core of this Sectorial Army". What does this even mean?
Honestly, given that this same phrase appears in both the ORC listing and Fusiliers listing (and not say under the Nisse that also have Fireteams: Core), the correct phrase is that "up to two ORCs may be part of a Fireteam: Core of Fusiliers.