From their website:
From tomorrow, there will be a new Kindred layout in the shop.
The Kindred will be broken down into troopers, specialists and command.
Specialists are also also subdivided to reflect weapon options and how Kev sees the range going over the next year.
For example, Light Machine Gunners will be coded HFK300 to HFK309, Snipers will be HFK310 to HFK319,
Rocket Launchers will be HFK320 to HFK329, Trench Raiders (CC) will be HFK330 to HFK339, Mortar will be HFK340 to HFK349.