Short WWII competition

A soldier in a military uniform aims and fires a rifle from a prone position in a grassy field, with smoke and dust erupting from the ground in front of him. The scene then cuts to a large formation of soldiers in uniform marching in unison, followed by a view from the deck of an aircraft carrier with a plane on the runway, then a formation of sailors marching in formation, and finally a massive military parade with numerous soldiers in formation.