For which main reason does the U.S. Armed Forces think it is important to continue refining the Legged Squad Support System (LS3)?
A) to intimidate enemy forces on the battlefield, scaring them off with new technologies
B) to carry supplies in combat zones, eventually replacing real mules that face danger doing the same job
C) to transport medical supplies to military personnel wounded in action
D) to replace real human soldiers that face danger on the battlefield doing the same job