Initiate Platoon:
Essentially what could be seen as the 'trainee' platoon who typically show their potential and train in and around the areas patrolled by the Militia (Elwynn, Redridge, Duskwood, Westfall, Stormwind) in order to achieve promotions
Footman Platoon:
The core of the Militia, ones who could be seen as a 'strike' squad around the areas Militia patrol under orders from Officers, they are generally seen as the 'typical footman' who patrols the roads and streets of the city and kingdom whilst having particular expertise of bursting into a building and quickly gaining control of arrest situations
Cavalry Platoon:
The mounted section of the Militia with the single goal of performing missions which are out of reach of those in the footman platoon such as hit-and-run missions on Horde towns or rescue missions which take them out of the reach of Stormwind, this would also apply to missions deep within the heart of Northrend
SWMI Platoon:
The hidden arm of the Stormwind Militia, unseen by the public they assume hidden aliases and perform missions of reacon and possibly sabotage at the same time, they use information they gather from their alternate persona to assist the footman platoon in their abilities to arrest criminals