Bounding overwatch
Bounding overwatch (also known as leapfrogging, moving overwatch, or the buddy system) is a military tactic of alternating movement of coordinated units to allow, if necessary, suppressive fire in support of offensive forward "fire and movement" or defensive "center peel" disengagement. As members of a unit (element to platoon level) take an overwatch posture, other members advance to cover; these two groups continually switch roles as they close with the enemy.