Hi Maeline, I saw that you're looking for a photo of your father....I don't know if either of these are him, but I found these and thought I'd share just in the off chance. These are both photos of a Bill/Billy Montgomery in high school in Oklahoma that might match the time your father was in school..
Billy Montgomery - Cushing High School
Bill Montgomery - Will Rogers High School
Billy Montgomery - Cushing High School
Bill Montgomery - Will Rogers High School