He displayed conspicuous gallantry and intrepidity above and beyond the call of duty when an American roadblock on the Ormoc Road was attacked by a group of enemy tanks. He left his covered position, and with a rocket launcher and 6 rounds of ammunition, advanced alone under intense machinegun and 37-mm. fire. Loading single-handedly, he destroyed the first tank, killing its occupants with a single round. As the crew of the second tank started to dismount and attack him, he killed 1 of the foe with his pistol, forcing the survivors to return to their vehicle, which he then destroyed with a second round. Three more hostile tanks moved up the road, so he flanked the first and eliminated it, and then, despite a hail of enemy fire, pressed forward again to destroy another. With his last round of ammunition he struck the remaining vehicle, causing it to crash down a steep embankment. Through his sustained heroism in the face of superior forces, Pfc. Vlug alone destroyed 5 enemy tanks and greatly facilitated successful accomplishment of his battalion's mission.