https://www.pcgamer.com/battlefield-5-companies-combat-roles-and-customization-detailed-in-a-new-trailer/

A new Battlefield 5 trailer dives into the intricacies of The Company, the collection of soldiers, weapons, and vehicles that you'll accumulate and customize as you play. Individual Companies can be assembled for each multiplayer faction, beginning with the British and Germans, each with its own unique soldiers and vehicles. 

As usual, four classes of soldiers will be available—Recon, Support, Assault, and Medic—and each can be further customized with Combat Roles, a system previously known as Archetypes. Each class will have two Combat Roles available to choose from at launch, with more coming in post-release Tides of War updates. Combat Roles can be swapped in and out on the fly: EA gave as an example an Assault class soldier switching to a vehicle-focused Combat Role in order to deal with a sudden onrush of enemy tanks in the midst of a battle.