You were a giant, literally.

Ghost, a military man. He was cleaning a building, taking out the enemies. When he finished his duty he immediately went to return to the base, but he stopped when he felt the building shaking a little. He raised his gun and pointed it anywhere, prepared in case there were more enemies or danger.

But it wasn't that, it was you. You were walking outside around the building, Ghost looked out the window and was perplexed, in shock.