You think other planets and outer space don't really exist??? Sounds like a rather eccentric claim.

What if they want something you can't easily take by force?

And I would caution in regarding military action as the key to accomplishing goals. Some wars can be won without firing a shot.

I think someone did it 35 minutes ago... Unless they also have time travel technology! >Doctor Who theme starts<

I can't say that I agree, but...

... what did the fallen angels promise humanity?
ha. alien... or robot? maybe alien robot funded by centrallized intelligence...

Perhaps they wanted the freedom to engage in certain behaviours without military involvement? As...

... maybe mosquitoes can't stop you from hiking in the woods, but they can be obnoxious... and cut your hike short.

It would be easiest to simply have a treaty with the mosquitoes.

Maybe a 50 year treaty?

So they're interstellar tourists who don't want their vacations ruined by humans?
Why 50 years, does that refer to some specific event?

They don't need to fire a single shot. The point is if we did, we'd lose. Send an ICBM towards them, they'll just shoot it down. Harass them with conventional stuff, they'll swat that down too. All those alien invasion movies where we win can't comprehend how terribly we'd lose, aside from War of the Worlds.

And besides, the only thing we have that can be provided that can't be found elsewhere is maybe vacation spots. Any civilization that's incapable of large scale space travel won't hold up to one that can fly star to star.

Oh, I'm sure aliens exist in one form or another, but not in any way as portrayed by Hollywood/sci-fi cliches. I highly doubt any xeno race advanced enough for interstellar travel would care for our piddly Podunk backwater other than to possibly strip-mine it for resources. It makes the whole "visitation" spiel nonsense even more unbelievable as it already was.

What if we (US military) unexpectedly found a way both to attract and disable UFO activity and used it repeatedly between 1947 and 1952... until the UFO's began taking countermeasures and initiated a 50 year treaty with Pres Eisenhower ('53) that allowed them to freely experiment on abductees in exchange for technology?

What if the aliens didn't return in '93 to re-up the treaty with Pres Bush?

As for what "they" want...

?

Some claim they want to manipulate our genetics in order to continue their line of DNA. Think of all of those Kings and Queens claiming lineage to God... or gods. And they see more possibilities in infiltration and assimilation than direct conflict.

Who knows, right?

Just out of pure curiosity, is there a reason the aliens seem to prefer Republican presidents?

I find such scenarios a bit far-fetched tbh (not least the idea that 1940s technology could have been used to disable interstellar space craft).
But in the end, yes, it's impossible to know anything for sure about those issues.

Taking your claim...

What did the fallen angels in Judeo-Christian teaching promise humanity?

Technology (among other things) in exchange for worshiping them... and for allowing them to have "relations" with human women.

The same stories on-and-on

Easier to goad an entire party of sellouts.

X-Files music intesifies.

You should always be skeptical.

While far-fetched, I can certainly entertain the idea that "we" chanced upon a weaponized application for advanced radar experiments (however short-lived) than "we" purposely envisioned, planned, and built a weapon to fight space aliens. ;)