"12 Angry Men." While a courtroom drama doesn't make an obvious double bill with a period piece, it does illustrate the importance of speaking up when you're sure you're right, even when the numbers are against you. All it takes for evil to conquer is for good men to do nothing.
"Cool Hand Luke." Going with the guy on the other side of the law? Yeah, because whatever Luke's failings as an upstanding citizen, his non-conformist agenda is something admirable.
"Full Metal Jacket." Strother Martin's character in "Cool Hand Luke" is right: "Some men you just can't reach" - they can't be broken down and re-molded. But others like PFC Gomer Pyle, USMC, who is played so chillingly by Vincent D'Onofrio, can only be broken down. Know the difference, especially since there's, shall I say, a greater "array" of personalities getting hired these days.
"John Carpenter's The Thing." I don't know about you, but I sometimes found myself wondering if some of the guys that dressed and acted like me weren't actually aliens hellbent on supplanting our police culture.
"A Few Good Men." Yeah, Jack Nicholson's the bad guy. But he's the also the one with the most memorable lines. Why? Because of the truth resonating within them. While his actions are reprehensible, his basic paradigm about being in the trenches is straight-on. There's a lot of men in "white uniforms" within our ranks who'll pass judgment on actions that wouldn't ever put themselves in a position of having to make a true command decision in the first place.