OKW - Sturm Pioneers - Extremely Strong combat unit right at the start of the game, will destroy most units close range, Can get MineSweepers and Toggle them on/off so they dont lose combat potential as well as Panzershreck later on for easy leveling vs vehicles.
To add to this, Sturmpioneers already get a repair bonus with the sweeper upgrade additionally to the veterancy buff. In the mod files there is also a small extra buff for the combination of sweeper and veterancy.