In the fall of 1943, "PT-59" was converted into a gunboat under the direction of its new commander, Lieutenant (and future U.S. President) John F. Kennedy when the chronic inaccuracy of the era's torpedoes and under-arming of the resulting craft were both recognized. She had all four of her torpedo tubes removed, as well as her two depth charges, but retained two heavy 40-millimeter Bofors cannon anti-aircraft guns fitted fore and aft. The refit also added six .50-caliber machine gun nests, with three on each side, behind shields, as well as additional weaponry.