Originally, a Brigade is a group composed of Army combat units on foot (Infantry), transport vehicles or armored with great firepower and shock (Cavalry) and weapons trajectory parabolic and others, like cannons, howitzers and throws - missile (Artillery).
Since the Marines are members of the Navy who stay on land and have similar organization to the Army, serving from defending bases until landing in the enemy camp, in contrast to members of the Navy, who are the members who work on ships. Also, the Air Force has its Infantry, with primary function of defending bases and personnel Aviation, composed of officers who undergo a four year course and prepared to fly their aircraft.
The Marine Brigade in Brazil is thus a fictitious name composed of terms borrowed from both Forces to designate a group of members who, as previously mentioned, gather to play online with other members, pass time, and to cultivate friendship through all communication channels that BFB provides for them.
Now if you ask why our behalf you are ready to explain. Okay, buddy?