So that the Alpha Over property is implicitly applied to every frame after I do it on the first frame.
I am using Cycles Render, and Blender 2.75
Edit - The full image has soldiers and the plane. One image has the plane and one image as only the soldiers.
The soldiers are animated, but are in a different layer than the plane. I want them to be rendered with the animation along with the plane without moving them to the same layer (using Render Layers.)
P.S. The soldier count will increase greatly later.
This is the full one (both soldiers and plane) -