I highly recommend 9th Company, about Soviet infantry in Afghanistan.
Kelley’s Heroes (Woof!! Woof!! That’s my other dog impression.
)
Paths of Glory (1957) It’s how Kubrick does WW1.
I highly recommend the Savior with Dennis Quaid and Pretty Village, Pretty Flame.
John Ford’s They Were Expendable, starring John Wayne, is probably the equal of Sands Of Iwo Jima. Wayne did a good many very good war films.
He also did The Green Berets, which is less recommended.
A little less well know but thoroughly enjoyable is The Beast about a Soviet tank crew in Afghanistan.
Re: Das Boot.
Side 2 of the disc I bought a decade ago won’t play. A new copy arrived in the mail earlier this week. 
Breaker Morant - Court-martial drama set during the Boer War, with exciting action sequences too. One of my all-time, hands-down favorite movies.
Master and Commander - Adventure at sea during the Napoleonic Wars.
The Patriot - A fictionalized tale of Francis Marion, the “Swamp Fox” of the American Revolution. Pretty good.
Glory - The best American Civil War movie, I think. Black troops (including former slaves) discover their own courage and strength in ways they never expected.
Paths of Glory - Why the French almost lost WWI. Kirk Douglas is great as a brave and principled officer.
Cold Mountain - The opening sequence, of the Battle of the Crater during the Petersburg campaign, is one of the best Civil War action sequences I’ve ever seen.
Gettysburg - A bit too windy, and with too many lengthy sequences of troops marching to and fro across fields, but Jeff Daniels should’ve won an Oscar for his quiet, intense depiction of one of my heroes, Col. Joshua Lawrence Chamberlain.
Saving Private Ryan - Realistic WWII action, heartfelt and moving story. A winner.
Apocalypse Now - A surreal and self-important movie that falls apart at the end, but the helicopter attack on the village is simply stunning.
Zulu has got to be my absolute favorite. It’s not WWII, but it is a fantastic movie.
For WWII, “Tora, Tora, Tora”, and “A Bridge Over River Kwai”. Both films are incredible.
WWI, “All Quiet On The Western Front”. Old movie, I think it won one of the first Oscars. Anyway, it’s from the German perspective of WWI. Great flick.
I know the OP mentioned ‘not so much Vietnam’, but you really should see “We Were Soldiers”, based upon the true story in the book “We Were Soldiers Once, And Young”, by Lt. Gen. Harold “Hap” Moore, about the begining of the Air Cavalry in Vietnam and the almost disasterous battle in the Il Drang Valley.
Mel Gibson plays Hap, and even if you hate Mel, he does this one well. Madeleine Stowe is awesome as Hap’s wife. There is a deleted scene that comes on the DVD of a church scene that has the real Hap Moore and his family sitting as members of the church in the audience while one of the GI’s wife’s breaks down during song. Very touching and a shame it was cut.
Two helicopter pilots, Snake Shit and Too Tall keep coming back in under fire during the battle to pick up wounded and resupply. Bruce “Snakeshit” Cradall was later awarded the Medal of Honor for his efforts that long day. So was Ed “Too Tall” Freeman.
It is a ‘must see’ for war movie buffs.
+1
Plus, it’s REAL
It’s available for Instant View on Netflix right now - that’s where I saw it
For comedy I would recommend The Russians are Coming The Russians are Coming. I havent seen it in decades, but I thought it was hilarious when I was a kid.
IMHO Band of Brothers should be first on your list if you haven’t seen it.
Two classics that I don’t see mentioned are Patton and The Guns of Navarrone. I think both are Oscar-winners?
The Thin Red Line is derided by a lot of people as pretentious and slow, but it is one of my favorite movies. IIRC it is about jungle fighting on Guadalcanal in WWII.
The Odd Angry Shot - Vietnam from an Aussie POV.
Catch-22
Where Eagle Dare
Father Goose - It takes place during WW2 and is one of my favorite movies. Sue me.
Put me in the lawsuit as well, because I never miss Father Goose when it comes on.
ETA: Operation Petticoat was my dad’s fave. He just loved it when the guy rides the motorcycle off the pier.
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Force 10 from Navarone is pretty good too, it has Harrison Ford , Robert Shaw and Edward Fox, it came out in 78
Is that the one where Richard Kiel says, ‘Aye, Blackie!’ to the Black guy?
yes that is the one. I think he also asks if his blood is red. The black guy is Carl Weathers.
One of the best anti-war movies is from 1957, MEN IN WAR, about the Korean War.
Hell Is for Heroes stars Steve McQueen, Fess Parker, James Coburn and Bob Newhart for comedy relief.