If you have extra ammo and you want to increase your hit percentage, you can score extra hits on Japanese officers who are interrogating the first two POWs in the warehouse and on the rooftop. In the warehouse, do NOT step onto the bridge to enter the office. From outside, you can hit either officer. The hit will register yet cause NO damage. On the rooftop, after you kill the first officer, stay on the planks and you can hammer away at the second one until you run out of ammo, unless you have the Infinite Ammo cheat activated. I have done this several times without fail.