B.W Mercenary Group is a mysterious organization that dispatches various Metal Maidens to assist in combat. It's members are elite mercenaries.
Established around the same time as the S.V.S., the BW quickly grew famous as a fast and efficient group capable in various operations so long as they are paid well for their services. They're also rumored to have various connections from different groups and various wealthy families such as the Morgan, Dupont, and Rothschild families. Support from these groups allow the BW to operate independently without interference by the S.V.S.
Being a member of the BW virtually makes one part of the elite class. The BWMG has numerous powerful Metal Maidens. One of it's members include the Desert Fox led by Rebecca Rommel.