Full Metal Jacket

The scene when Joker is aiding Pyle while jogging, they are placed deliberately far away from the group. and he is dragging Joker behind with him. This shows that Pyle is a threat because he is always falling behind. After this scene there is a very literal scene when Pyle falls down many marines fall down with Pyle while trying to pick him up. This message is repeated by the 'Jelly Donut' scene when Pyle messes up the whole marine core is effected by doing pushups