SOC = Division, Such as Division 1, 3, etc
Under SOC you have Battalions just like the rest of the city.
Hazmat Battalion - Hazmat 1, E44, etc
Rescue Battalion - Rescues and Squads
Marine Battalion - Marine units.
You don't hear the Marine Battalion much but they do exist.
On a Marine Company you have, depending on size.
1 Officer and 2 Firefighters
Then you have the Pilot, Wipers and Engineers. All have to be FF's first.