Wetmore's next success was on February 14, 1945, when he shot down three Fw 190s in one day not far from the Dümmer lake airfield. His wingman took down a fourth enemy plane. In total on that day, the entire 359th Fighter Group recorded 4.5 victories. Wetmore achieved his last victory on March 15, 1945 near Wittenberg, destroying an Ме-163 rocket fighter. While he was chasing the Me 163, the air speed indicator on Wetmore's P-51D showed 600 miles per hour. In total, Wetmore completed around 142 combat flights throughout World War II. His final score was 21.25 destroyed, one damaged in aerial combat and 2.33 ground victories. It is the highest score in the 359th Fighter Group and eighth best of all American flying aces in the European Theater. On VE Day, he was a 21-year-old major.