Militaires Sans Frontières (French for Soldiers Without Borders; lit. Military Without Frontiers), abbreviated as MSF and also known as Outer Heaven, was a private military company in the early 1970s founded and led by Big Boss. Because of their mercenary status, their questionable tactics on the battlefield, and their usage of an off-shore forward operating base in the middle of the Caribbean Sea during the mid 1970s, they were frequently referred to by their enemies as pirates.