Really good movie but where can I get?

I was at the premier of this movie in 1955 Wichita. Believe it is the only movie that ever had a premier in Wichita, Kansas.
At 10yrs. old, I was very impressed with how good the Movie was. I was used to the Roy Rogers, Gene Autry type cowboy movies and this movie was my first realistic, well acted and with a great story line movie I ever saw.

I try to get it but can't find it, anyone know please tell us.