Geoffrey Arbuthnot Islip " Blinky " ( Hoot Gibson ), the bespectacled son of Col. "Raw Meat" Islip, is scorned by his fellow cavalrymen stationed on the Mexican border because his previous military experience was as a Boy Scout. He redeems himself by rescuing Major Kileen's daughter Mary Lou ( Esther Ralston ), from kidnappers, following their trail in Boy Scout fashion