A center peel is used when the element encounters an overwhelming force from the front, especially in staggered column, and needs to withdraw to their rear. This will be used when operating in urban terrain and the element needs to move back down a street or in open terrain where natural cover and concealment is to the rear.
A line peel is used when the element encounters an overwhelming force from the front and needs to withdraw to cover on their right or left. This will be used in urban terrain when moving off a main street onto a side road or when out in the open to move towards natural cover and concealment.