So im not sure if this is a faction only issue, or whether it is faction wide, but what is the point in (melee Sergeants) ?
So tier 1 playing as Bohemia your initial choice of foot is between the two Sergeants models, one carrying the spear and the other Axes/Swords.
The Spear variant is much better in all respects with exception of a small deficiency in charge. Otherwise its attack/defence/damage are all better than the melee model + it has better armour penetration + ITS Cheaper!!
It renders the Melee sergeant model pointless.