Ideas for war movies I would love to see:
2.) The Battle of the Falkland Islands (WWI)
4.) The Israel Air Force during the Six Day War or Yom Kippur War.
These two would never be made by Hollywood for your reason:
Never, EVAH, underestimate the anti-capitalist / anti-colonial outlook of the movies makers over in the Peoples Republic of California.
when you add in anti-US ally (i.e., anti-UK), anti-Israel (which is so odd, given how many in Hollywood are Jewish), pro-socialism/communism (so pro-Argentina). Even though you mean the WWI Battle of the Falkland Islands, Hollywood would still associate it with the modern theme.
Now, if you pick a topic that glorifies crime, socialism, communism, or anyone who hates the US, or shows the US, capitalism, business, work ethic, free markets, or US history in a bad light, then you have a good chance of Hollywood making it.