When it comes to holiday weekends, the TV question is: Which channels aren't having massive marathons?
We can't include them all anymore -- there are just too many. At least we can tell you about the longest, the coolest, the most essential.
And, of course, the ones that most aptly salute the meaning behind Memorial Day.
(Find complete weekend listings at newsday.com/tv.
Movie marathons (AMC, Friday 9 a.m.-Sunday 6 a.m., Sunday 10 a.m.-8 p.m., Monday 3 a.m.-6 a.m., 9 a.m.-10 p.m.) -- War-filled lineup includes "Patton" (Friday at 1 p.m. and Sunday 2 a.m.), John Wayne in his Vietnam saga "The Green Berets" (Friday at 5 p.m., Saturday at 11 a.m., Monday at 1 p.m.), Clint Eastwood's "Flags of Our Fathers" and "Letters From Iwo Jima" (Saturday at 8 and 11 p.m.), "Apocalypse Now Redux" (Sunday at 12:30 p.m., all on AMC).
Movie marathon (Turner Classic Movies, Sunday 6 a.m.-Tuesday 6 a.m.) -- Samuel Fuller's Korean War classic "The Steel Helmet" (Sunday at 4:45 p.m.) is among the highlights, also including Gary Cooper as World War I's "Sergeant York" (Sunday at 8 p.m.), the John F. Kennedy docudrama "PT 109" (Monday at 4:30 a.m.), best-picture epic "The Bridge on the River Kwai" (Monday at 8 p.m., all on TCM).
The Unit (Cloo, Sunday 6 a.m.-6 p.m.; Universal HD, Monday 6 a.m.-Tuesday 6 a.m.) -- Contemporary Army special ops do their thing in Dennis Haysbert series.
World War I in Colour (Sunday 8-11 p.m., Military Channel) and "World War II in Color" (Monday noon-1 p.m., Military Channel); "WWII in HD" (H2, Monday 9 a.m.-6 p.m.) and "Vietnam in HD" (H2, Monday 6 p.m.-4 a.m.) -- Archival footage gains startling new clarity in immersive docuseries.
Hellcats of the Navy (Antenna TV/11.4, Monday at 5 a.m.) -- Ronald Reagan and wife Nancy Davis starred together only in this 1957 feature. Military marathon continues through 2 a.m., including Humphrey Bogart in "Sahara"
World War II programs
The Mary Tyler Moore Show (Hallmark, Saturday 10 a.m.-10 p.m.) and The Bob Newhart Show (Hallmark, Sunday 10 a.m.-10 p.m.) -- Together again: comedy hits from CBS' legendary '70s Saturday night lineup.
Necessary Roughness (Cloo, Sunday 6 p.m.-Monday 6 a.m.) and Royal Pains (Cloo, Monday 6 a.m.-Tuesday 6 a.m.) -- Refresher replays before USA series' new seasons premiere June 6.
Pawn Stars (History, Sunday 4 p.m.-4 a.m., Monday 8 a.m.-9 p.m.) -- Marathon concludes with two new episodes.
Face Off (Chiller, Monday 6 a.m.-Tuesday 6 a.m.) -- Syfy's prosthetic movie makeup competition.