And Then There Were None?
since you mention older movies and there is a colonel in the list, just for fun i'll guess an old favorite, with a key word in the title:the major and the minor (1942)
Right now I'm thinking two things...1. The film came out before 19752. The names are going to be more familiar as we go. Antares, I know you've had a rough go with the people here whose memory for classic film doesn't go back further than twenty years. I'm thinking there's a giveaway name near the end. Considering your history, it might even be a name that's part of if not the entire title of the film.
A Matter of Life and Death aka. Starway to Heaven